77676665 has 32 divisors (see below), whose sum is σ = 105062400. Its totient is φ = 54648000.

The previous prime is 77676661. The next prime is 77676701. The reversal of 77676665 is 56667677.

It is not a de Polignac number, because 77676665 - 2² = 77676661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77676661) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 390236 + ... + 390434.

It is an arithmetic number, because the mean of its divisors is an integer number (3283200).

Almost surely, 2^77676665 is an apocalyptic number.

It is an amenable number.

77676665 is a deficient number, since it is larger than the sum of its proper divisors (27385735).

77676665 is a wasteful number, since it uses less digits than its factorization.

77676665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413.

The product of its digits is 2222640, while the sum is 50.

The square root of 77676665 is about 8813.4366168935. The cubic root of 77676665 is about 426.6746658521.

The spelling of 77676665 in words is "seventy-seven million, six hundred seventy-six thousand, six hundred sixty-five".