64768431 has 32 divisors (see below), whose sum is σ = 107903488. Its totient is φ = 33644160.

The previous prime is 64768427. The next prime is 64768433. The reversal of 64768431 is 13486746.

It is not a de Polignac number, because 64768431 - 2² = 64768427 is a prime.

It is a super-2 number, since 2×64768431² = 8389899308403522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 64768431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64768433) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16521 + ... + 20061.

It is an arithmetic number, because the mean of its divisors is an integer number (3371984).

Almost surely, 2^64768431 is an apocalyptic number.

64768431 is a deficient number, since it is larger than the sum of its proper divisors (43135057).

64768431 is a wasteful number, since it uses less digits than its factorization.

64768431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3631.

The product of its digits is 96768, while the sum is 39.

The square root of 64768431 is about 8047.8836348446. The cubic root of 64768431 is about 401.5945331307.

The spelling of 64768431 in words is "sixty-four million, seven hundred sixty-eight thousand, four hundred thirty-one".