64172857 has 4 divisors (see below), whose sum is σ = 73340416. Its totient is φ = 55005300.

The previous prime is 64172833. The next prime is 64172881. The reversal of 64172857 is 75827146.

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 an interprime number because it is at equal distance from previous prime (64172833) and next prime (64172881).

It is not a de Polignac number, because 64172857 - 2⁷ = 64172729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64172887) 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, 4583769 + ... + 4583782.

It is an arithmetic number, because the mean of its divisors is an integer number (18335104).

Almost surely, 2^64172857 is an apocalyptic number.

It is an amenable number.

64172857 is a deficient number, since it is larger than the sum of its proper divisors (9167559).

64172857 is an equidigital number, since it uses as much as digits as its factorization.

64172857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9167558.

The product of its digits is 94080, while the sum is 40.

The square root of 64172857 is about 8010.7962775245. The cubic root of 64172857 is about 400.3597950218.

The spelling of 64172857 in words is "sixty-four million, one hundred seventy-two thousand, eight hundred fifty-seven".