77568428 has 24 divisors (see below), whose sum is σ = 159331872. Its totient is φ = 32344704.

The previous prime is 77568419. The next prime is 77568461. The reversal of 77568428 is 82486577.

It is a super-2 number, since 2×77568428² = 12033722044782368, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36401 + ... + 38472.

It is an arithmetic number, because the mean of its divisors is an integer number (6638828).

Almost surely, 2^77568428 is an apocalyptic number.

It is an amenable number.

77568428 is an abundant number, since it is smaller than the sum of its proper divisors (81763444).

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

77568428 is a wasteful number, since it uses less digits than its factorization.

77568428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74921 (or 74919 counting only the distinct ones).

The product of its digits is 752640, while the sum is 47.

The square root of 77568428 is about 8807.2940225702. The cubic root of 77568428 is about 426.4763932954.

The spelling of 77568428 in words is "seventy-seven million, five hundred sixty-eight thousand, four hundred twenty-eight".