72451631 has 8 divisors (see below), whose sum is σ = 82857984. Its totient is φ = 62059320.

The previous prime is 72451627. The next prime is 72451663. The reversal of 72451631 is 13615427.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72451631 - 2² = 72451627 is a prime.

It is a super-2 number, since 2×72451631² = 10498477669120322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72451594 and 72451603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72451031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12326 + ... + 17228.

It is an arithmetic number, because the mean of its divisors is an integer number (10357248).

Almost surely, 2^72451631 is an apocalyptic number.

72451631 is a deficient number, since it is larger than the sum of its proper divisors (10406353).

72451631 is a wasteful number, since it uses less digits than its factorization.

72451631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7021.

The product of its digits is 5040, while the sum is 29.

The square root of 72451631 is about 8511.8523835884. The cubic root of 72451631 is about 416.8847950858.

The spelling of 72451631 in words is "seventy-two million, four hundred fifty-one thousand, six hundred thirty-one".