71864631 has 48 divisors (see below), whose sum is σ = 115031520. Its totient is φ = 44323200.

The previous prime is 71864629. The next prime is 71864633. The reversal of 71864631 is 13646817.

71864631 is a `hidden beast` number, since 7 + 1 + 8 + 646 + 3 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (71864629) and next prime (71864633).

It is not a de Polignac number, because 71864631 - 2¹ = 71864629 is a prime.

It is a super-2 number, since 2×71864631² = 10329050377532322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71864633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 711481 + ... + 711581.

It is an arithmetic number, because the mean of its divisors is an integer number (2396490).

Almost surely, 2^71864631 is an apocalyptic number.

71864631 is a deficient number, since it is larger than the sum of its proper divisors (43166889).

71864631 is a wasteful number, since it uses less digits than its factorization.

71864631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221 (or 196 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 71864631 is about 8477.3009265921. The cubic root of 71864631 is about 415.7558798702.

The spelling of 71864631 in words is "seventy-one million, eight hundred sixty-four thousand, six hundred thirty-one".