64400577 has 4 divisors (see below), whose sum is σ = 85867440. Its totient is φ = 42933716.

The previous prime is 64400551. The next prime is 64400587. The reversal of 64400577 is 77500446.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 64400577 - 2⁷ = 64400449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64400587) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10733427 + ... + 10733432.

It is an arithmetic number, because the mean of its divisors is an integer number (21466860).

Almost surely, 2^64400577 is an apocalyptic number.

It is an amenable number.

64400577 is a deficient number, since it is larger than the sum of its proper divisors (21466863).

64400577 is a wasteful number, since it uses less digits than its factorization.

64400577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21466862.

The product of its (nonzero) digits is 23520, while the sum is 33.

The square root of 64400577 is about 8024.9970093452. The cubic root of 64400577 is about 400.8328003224.

The spelling of 64400577 in words is "sixty-four million, four hundred thousand, five hundred seventy-seven".