64631 has 6 divisors (see below), whose sum is σ = 75240. Its totient is φ = 55356.

The previous prime is 64627. The next prime is 64633. The reversal of 64631 is 13646.

It is not a de Polignac number, because 64631 - 2² = 64627 is a prime.

It is a super-2 number, since 2×64631² = 8354332322, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64633) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 611 + ... + 708.

It is an arithmetic number, because the mean of its divisors is an integer number (12540).

2⁶⁴⁶³¹ is an apocalyptic number.

64631 is a deficient number, since it is larger than the sum of its proper divisors (10609).

64631 is a wasteful number, since it uses less digits than its factorization.

64631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1333 (or 1326 counting only the distinct ones).

The product of its digits is 432, while the sum is 20.

The square root of 64631 is about 254.2262771627. The cubic root of 64631 is about 40.1310286520.

The spelling of 64631 in words is "sixty-four thousand, six hundred thirty-one".