71723631 has 16 divisors (see below), whose sum is σ = 110157824. Its totient is φ = 40660704.

The previous prime is 71723623. The next prime is 71723633. The reversal of 71723631 is 13632717.

It is not a de Polignac number, because 71723631 - 2³ = 71723623 is a prime.

It is a super-2 number, since 2×71723631² = 10288558487648322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71723633) 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, 10780 + ... + 16113.

It is an arithmetic number, because the mean of its divisors is an integer number (6884864).

Almost surely, 2^71723631 is an apocalyptic number.

71723631 is a deficient number, since it is larger than the sum of its proper divisors (38434193).

71723631 is a wasteful number, since it uses less digits than its factorization.

71723631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27030.

The product of its digits is 5292, while the sum is 30.

The square root of 71723631 is about 8468.9805171579. The cubic root of 71723631 is about 415.4837944273.

The spelling of 71723631 in words is "seventy-one million, seven hundred twenty-three thousand, six hundred thirty-one".