64432731 has 16 divisors (see below), whose sum is σ = 93870720. Its totient is φ = 38987520.

The previous prime is 64432721. The next prime is 64432733. The reversal of 64432731 is 13723446.

It is not a de Polignac number, because 64432731 - 2⁵ = 64432699 is a prime.

It is a super-2 number, since 2×64432731² = 8303153648236722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64432733) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27211 + ... + 29483.

It is an arithmetic number, because the mean of its divisors is an integer number (5866920).

Almost surely, 2^64432731 is an apocalyptic number.

64432731 is a deficient number, since it is larger than the sum of its proper divisors (29437989).

64432731 is a wasteful number, since it uses less digits than its factorization.

64432731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3146.

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

The square root of 64432731 is about 8027.0001245795. Note that the first 3 decimals coincide. The cubic root of 64432731 is about 400.8994986559.

The spelling of 64432731 in words is "sixty-four million, four hundred thirty-two thousand, seven hundred thirty-one".