64390777 has 16 divisors (see below), whose sum is σ = 73866240. Its totient is φ = 55558800.

The previous prime is 64390763. The next prime is 64390793. The reversal of 64390777 is 77709346.

It is a de Polignac number, because none of the positive numbers 2^k-64390777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64390727) 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, 34252 + ... + 36082.

It is an arithmetic number, because the mean of its divisors is an integer number (4616640).

Almost surely, 2^64390777 is an apocalyptic number.

It is an amenable number.

64390777 is a deficient number, since it is larger than the sum of its proper divisors (9475463).

64390777 is a wasteful number, since it uses less digits than its factorization.

64390777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2004.

The product of its (nonzero) digits is 222264, while the sum is 43.

The square root of 64390777 is about 8024.3863939868. The cubic root of 64390777 is about 400.8124673746.

The spelling of 64390777 in words is "sixty-four million, three hundred ninety thousand, seven hundred seventy-seven".