64904231 has 4 divisors (see below), whose sum is σ = 74176272. Its totient is φ = 55632192.

The previous prime is 64904221. The next prime is 64904263. The reversal of 64904231 is 13240946.

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

It is not a de Polignac number, because 64904231 - 2²² = 60709927 is a prime.

It is a super-2 number, since 2×64904231² = 8425118403402722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64904194 and 64904203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64904221) 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, 4636010 + ... + 4636023.

It is an arithmetic number, because the mean of its divisors is an integer number (18544068).

Almost surely, 2^64904231 is an apocalyptic number.

64904231 is a deficient number, since it is larger than the sum of its proper divisors (9272041).

64904231 is an equidigital number, since it uses as much as digits as its factorization.

64904231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9272040.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 64904231 is about 8056.3162177263. The cubic root of 64904231 is about 401.8750116782.

The spelling of 64904231 in words is "sixty-four million, nine hundred four thousand, two hundred thirty-one".