64577691 has 24 divisors (see below), whose sum is σ = 97634160. Its totient is φ = 41086656.

The previous prime is 64577677. The next prime is 64577761. The reversal of 64577691 is 19677546.

It is a happy number.

It is not a de Polignac number, because 64577691 - 2⁵ = 64577659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64577621) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15820 + ... + 19478.

It is an arithmetic number, because the mean of its divisors is an integer number (4068090).

Almost surely, 2^64577691 is an apocalyptic number.

64577691 is a deficient number, since it is larger than the sum of its proper divisors (33056469).

64577691 is a wasteful number, since it uses less digits than its factorization.

64577691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3755 (or 3752 counting only the distinct ones).

The product of its digits is 317520, while the sum is 45.

The square root of 64577691 is about 8036.0245768664. The cubic root of 64577691 is about 401.1999197986.

The spelling of 64577691 in words is "sixty-four million, five hundred seventy-seven thousand, six hundred ninety-one".