77069880 has 128 divisors (see below), whose sum is σ = 260366400. Its totient is φ = 20528640.

The previous prime is 77069879. The next prime is 77069911. The reversal of 77069880 is 8896077.

It is a super-3 number, since 3×77069880³ (a number of 25 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 87040 + ... + 87920.

Almost surely, 2^77069880 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 77069880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (130183200).

77069880 is an abundant number, since it is smaller than the sum of its proper divisors (183296520).

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

77069880 is an equidigital number, since it uses as much as digits as its factorization.

77069880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 913 (or 891 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 45.

The square root of 77069880 is about 8778.9452669441. The cubic root of 77069880 is about 425.5607454091.

The spelling of 77069880 in words is "seventy-seven million, sixty-nine thousand, eight hundred eighty".