64872257 has 4 divisors (see below), whose sum is σ = 64899120. Its totient is φ = 64845396.

The previous prime is 64872239. The next prime is 64872263. The reversal of 64872257 is 75227846.

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 64872257 - 2⁸ = 64872001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64872277) 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 3 ways as a sum of consecutive naturals, for example, 9407 + ... + 14772.

It is an arithmetic number, because the mean of its divisors is an integer number (16224780).

Almost surely, 2^64872257 is an apocalyptic number.

It is an amenable number.

64872257 is a deficient number, since it is larger than the sum of its proper divisors (26863).

64872257 is a wasteful number, since it uses less digits than its factorization.

64872257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26862.

The product of its digits is 188160, while the sum is 41.

The square root of 64872257 is about 8054.3315675480. The cubic root of 64872257 is about 401.8090084709.

The spelling of 64872257 in words is "sixty-four million, eight hundred seventy-two thousand, two hundred fifty-seven".