78000000 has 224 divisors, whose sum is σ = 278902680. Its totient is φ = 19200000.

The previous prime is 77999951. The next prime is 78000001. The reversal of 78000000 is 87.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78000001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 5999994 + ... + 6000006.

Almost surely, 2^78000000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (139451340).

78000000 is an abundant number, since it is smaller than the sum of its proper divisors (200902680).

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

78000000 is an frugal number, since it uses more digits than its factorization.

78000000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60 (or 23 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 15.

The square root of 78000000 is about 8831.7608663278. The cubic root of 78000000 is about 427.2658681698.

Adding to 78000000 its reverse (87), we get a palindrome (78000087).

The spelling of 78000000 in words is "seventy-eight million", and thus it is an aban number and an uban number.