72312690 has 32 divisors (see below), whose sum is σ = 181097856. Its totient is φ = 18444800.

The previous prime is 72312683. The next prime is 72312697. The reversal of 72312690 is 9621327.

It is an interprime number because it is at equal distance from previous prime (72312683) and next prime (72312697).

It is a super-2 number, since 2×72312690² = 10458250270072200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (72312697) 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, 51711 + ... + 53090.

It is an arithmetic number, because the mean of its divisors is an integer number (5659308).

Almost surely, 2^72312690 is an apocalyptic number.

72312690 is an abundant number, since it is smaller than the sum of its proper divisors (108785166).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72312690 is a wasteful number, since it uses less digits than its factorization.

72312690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104834.

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 72312690 is about 8503.6868474797. The cubic root of 72312690 is about 416.6181369257.

The spelling of 72312690 in words is "seventy-two million, three hundred twelve thousand, six hundred ninety".