64723431 has 4 divisors (see below), whose sum is σ = 86297912. Its totient is φ = 43148952.

The previous prime is 64723429. The next prime is 64723457. The reversal of 64723431 is 13432746.

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

It is not a de Polignac number, because 64723431 - 2¹ = 64723429 is a prime.

It is a super-2 number, since 2×64723431² = 8378245040823522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64723411) 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, 10787236 + ... + 10787241.

It is an arithmetic number, because the mean of its divisors is an integer number (21574478).

Almost surely, 2^64723431 is an apocalyptic number.

64723431 is a deficient number, since it is larger than the sum of its proper divisors (21574481).

64723431 is a wasteful number, since it uses less digits than its factorization.

64723431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21574480.

The product of its digits is 12096, while the sum is 30.

The square root of 64723431 is about 8045.0873829934. The cubic root of 64723431 is about 401.5015045743.

The spelling of 64723431 in words is "sixty-four million, seven hundred twenty-three thousand, four hundred thirty-one".