72870431 has 8 divisors (see below), whose sum is σ = 74146800. Its totient is φ = 71603712.

The previous prime is 72870409. The next prime is 72870443. The reversal of 72870431 is 13407827.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72870431 is a prime.

It is a super-2 number, since 2×72870431² = 10620199428251522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72870461) 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, 13745 + ... + 18293.

It is an arithmetic number, because the mean of its divisors is an integer number (9268350).

Almost surely, 2^72870431 is an apocalyptic number.

72870431 is a deficient number, since it is larger than the sum of its proper divisors (1276369).

72870431 is a wasteful number, since it uses less digits than its factorization.

72870431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4825.

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 72870431 is about 8536.4179255704. The cubic root of 72870431 is about 417.6865070825.

The spelling of 72870431 in words is "seventy-two million, eight hundred seventy thousand, four hundred thirty-one".