71712431 has 12 divisors (see below), whose sum is σ = 83863872. Its totient is φ = 61141248.

The previous prime is 71712383. The next prime is 71712449. The reversal of 71712431 is 13421717.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-71712431 is a prime.

It is a super-2 number, since 2×71712431² = 10285345519859522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71712431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71712481) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5666 + ... + 13248.

It is an arithmetic number, because the mean of its divisors is an integer number (6988656).

Almost surely, 2^71712431 is an apocalyptic number.

71712431 is a deficient number, since it is larger than the sum of its proper divisors (12151441).

71712431 is a wasteful number, since it uses less digits than its factorization.

71712431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7790 (or 7783 counting only the distinct ones).

The product of its digits is 1176, while the sum is 26.

The square root of 71712431 is about 8468.3192547282. The cubic root of 71712431 is about 415.4621666845.

The spelling of 71712431 in words is "seventy-one million, seven hundred twelve thousand, four hundred thirty-one".