64423257 has 8 divisors (see below), whose sum is σ = 85946784. Its totient is φ = 42924288.

The previous prime is 64423241. The next prime is 64423267. The reversal of 64423257 is 75232446.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 64423257 - 2⁴ = 64423241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64423237) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1258 + ... + 11420.

It is an arithmetic number, because the mean of its divisors is an integer number (10743348).

Almost surely, 2^64423257 is an apocalyptic number.

It is an amenable number.

64423257 is a deficient number, since it is larger than the sum of its proper divisors (21523527).

64423257 is a wasteful number, since it uses less digits than its factorization.

64423257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12279.

The product of its digits is 40320, while the sum is 33.

The square root of 64423257 is about 8026.4099695941. The cubic root of 64423257 is about 400.8798486635.

The spelling of 64423257 in words is "sixty-four million, four hundred twenty-three thousand, two hundred fifty-seven".