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77000000 = 2656711

77000000 has 196 divisors, whose sum is σ = 238121952. Its totient is φ = 24000000.

The previous prime is 76999981. The next prime is 77000003. The reversal of 77000000 is 77.

Adding to 77000000 its reverse (77), we get a palindrome (77000077).

Multipling 77000000 by its reverse (77), we get a square (5929000000 = 770002).

77000000 divided by its reverse (77) gives a 6-th power (1000000 = 106).

It can be divided in two parts, 7 and 7000000, that multiplied together give a square (49000000 = 70002).

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77000003) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 6999995 + ... + 7000005.

Almost surely, 277000000 is an apocalyptic number.

77000000 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119060976).

77000000 is an abundant number, since it is smaller than the sum of its proper divisors (161121952).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77000000 is an frugal number, since it uses more digits than its factorization.

77000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60 (or 25 counting only the distinct ones).

The product of its (nonzero) digits is 49, while the sum is 14.

The square root of 77000000 is about 8774.9643873921. The cubic root of 77000000 is about 425.4320865115.

The spelling of 77000000 in words is "seventy-seven million", and thus it is an aban number and an uban number.