64756457 has 4 divisors (see below), whose sum is σ = 64907136. Its totient is φ = 64605780.

The previous prime is 64756429. The next prime is 64756463. The reversal of 64756457 is 75465746.

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 64756457 - 2²⁰ = 63707881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64756487) 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, 74693 + ... + 75554.

It is an arithmetic number, because the mean of its divisors is an integer number (16226784).

Almost surely, 2^64756457 is an apocalyptic number.

It is an amenable number.

64756457 is a deficient number, since it is larger than the sum of its proper divisors (150679).

64756457 is a wasteful number, since it uses less digits than its factorization.

64756457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150678.

The product of its digits is 705600, while the sum is 44.

The square root of 64756457 is about 8047.1396781714. The cubic root of 64756457 is about 401.5697834740.

The spelling of 64756457 in words is "sixty-four million, seven hundred fifty-six thousand, four hundred fifty-seven".