77691628 has 24 divisors (see below), whose sum is σ = 155891232. Its totient is φ = 33187584.

The previous prime is 77691623. The next prime is 77691641. The reversal of 77691628 is 82619677.

It is a happy number.

It is a super-2 number, since 2×77691628² = 12071978122580768, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (77691623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4500 + ... + 13252.

It is an arithmetic number, because the mean of its divisors is an integer number (6495468).

Almost surely, 2^77691628 is an apocalyptic number.

It is an amenable number.

77691628 is an abundant number, since it is smaller than the sum of its proper divisors (78199604).

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

77691628 is a wasteful number, since it uses less digits than its factorization.

77691628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9081 (or 9079 counting only the distinct ones).

The product of its digits is 254016, while the sum is 46.

The square root of 77691628 is about 8814.2854503357. The cubic root of 77691628 is about 426.7020611371.

The spelling of 77691628 in words is "seventy-seven million, six hundred ninety-one thousand, six hundred twenty-eight".