77616881 has 16 divisors (see below), whose sum is σ = 87091200. Its totient is φ = 68820048.

The previous prime is 77616871. The next prime is 77616899. The reversal of 77616881 is 18861677.

It is not a de Polignac number, because 77616881 - 2¹⁸ = 77354737 is a prime.

It is a super-2 number, since 2×77616881² = 12048760432336322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (77616841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18650 + ... + 22428.

It is an arithmetic number, because the mean of its divisors is an integer number (5443200).

Almost surely, 2^77616881 is an apocalyptic number.

It is an amenable number.

77616881 is a deficient number, since it is larger than the sum of its proper divisors (9474319).

77616881 is a wasteful number, since it uses less digits than its factorization.

77616881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3868.

The product of its digits is 112896, while the sum is 44.

The square root of 77616881 is about 8810.0443245196. The cubic root of 77616881 is about 426.5651740882.

The spelling of 77616881 in words is "seventy-seven million, six hundred sixteen thousand, eight hundred eighty-one".