64624457 has 4 divisors (see below), whose sum is σ = 67434240. Its totient is φ = 61814676.

The previous prime is 64624451. The next prime is 64624477. The reversal of 64624457 is 75442646.

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 a de Polignac number, because none of the positive numbers 2^k-64624457 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64624457.

It is not an unprimeable number, because it can be changed into a prime (64624451) 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, 1404857 + ... + 1404902.

It is an arithmetic number, because the mean of its divisors is an integer number (16858560).

Almost surely, 2^64624457 is an apocalyptic number.

It is an amenable number.

64624457 is a deficient number, since it is larger than the sum of its proper divisors (2809783).

64624457 is a wasteful number, since it uses less digits than its factorization.

64624457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2809782.

The product of its digits is 161280, while the sum is 38.

The square root of 64624457 is about 8038.9338223424. The cubic root of 64624457 is about 401.2967436801.

The spelling of 64624457 in words is "sixty-four million, six hundred twenty-four thousand, four hundred fifty-seven".