64557871 has 4 divisors (see below), whose sum is σ = 73780432. Its totient is φ = 55335312.

The previous prime is 64557863. The next prime is 64557881. The reversal of 64557871 is 17875546.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64557871 - 2³ = 64557863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64557811) 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, 4611270 + ... + 4611283.

It is an arithmetic number, because the mean of its divisors is an integer number (18445108).

Almost surely, 2^64557871 is an apocalyptic number.

64557871 is a deficient number, since it is larger than the sum of its proper divisors (9222561).

64557871 is an equidigital number, since it uses as much as digits as its factorization.

64557871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9222560.

The product of its digits is 235200, while the sum is 43.

The square root of 64557871 is about 8034.7912854037. The cubic root of 64557871 is about 401.1588705552.

The spelling of 64557871 in words is "sixty-four million, five hundred fifty-seven thousand, eight hundred seventy-one".