72015690 has 32 divisors (see below), whose sum is σ = 177511680. Its totient is φ = 18684864.

The previous prime is 72015677. The next prime is 72015701. The reversal of 72015690 is 9651027.

It is a super-2 number, since 2×72015690² = 10372519212352200, which contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31330 + ... + 33549.

It is an arithmetic number, because the mean of its divisors is an integer number (5547240).

Almost surely, 2^72015690 is an apocalyptic number.

72015690 is an abundant number, since it is smaller than the sum of its proper divisors (105495990).

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

72015690 is a wasteful number, since it uses less digits than its factorization.

72015690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64926.

The product of its (nonzero) digits is 3780, while the sum is 30.

The square root of 72015690 is about 8486.2058659922. The cubic root of 72015690 is about 416.0469814111.

The spelling of 72015690 in words is "seventy-two million, fifteen thousand, six hundred ninety".