64456557 has 32 divisors (see below), whose sum is σ = 98620416. Its totient is φ = 37065600.

The previous prime is 64456543. The next prime is 64456583. The reversal of 64456557 is 75565446.

It is not a de Polignac number, because 64456557 - 2⁴ = 64456541 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64456757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 123457 + ... + 123977.

It is an arithmetic number, because the mean of its divisors is an integer number (3081888).

Almost surely, 2^64456557 is an apocalyptic number.

It is an amenable number.

64456557 is a deficient number, since it is larger than the sum of its proper divisors (34163859).

64456557 is a wasteful number, since it uses less digits than its factorization.

64456557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721.

The product of its digits is 504000, while the sum is 42.

The square root of 64456557 is about 8028.4841034905. The cubic root of 64456557 is about 400.9489075727.

Subtracting 64456557 from its reverse (75565446), we obtain a square (11108889 = 3333²).

The spelling of 64456557 in words is "sixty-four million, four hundred fifty-six thousand, five hundred fifty-seven".