65438631 has 16 divisors (see below), whose sum is σ = 97182720. Its totient is φ = 43519320.

The previous prime is 65438629. The next prime is 65438651. The reversal of 65438631 is 13683456.

65438631 is a `hidden beast` number, since 6 + 543 + 86 + 31 = 666.

It is not a de Polignac number, because 65438631 - 2¹ = 65438629 is a prime.

It is a super-2 number, since 2×65438631² = 8564428854308322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65438621) 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, 9226 + ... + 14696.

It is an arithmetic number, because the mean of its divisors is an integer number (6073920).

Almost surely, 2^65438631 is an apocalyptic number.

65438631 is a deficient number, since it is larger than the sum of its proper divisors (31744089).

65438631 is a wasteful number, since it uses less digits than its factorization.

65438631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5923 (or 5917 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 65438631 is about 8089.4147501534. The cubic root of 65438631 is about 402.9749669916.

The spelling of 65438631 in words is "sixty-five million, four hundred thirty-eight thousand, six hundred thirty-one".