72326657 has 4 divisors (see below), whose sum is σ = 77890260. Its totient is φ = 66763056.

The previous prime is 72326647. The next prime is 72326659. The reversal of 72326657 is 75662327.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 39137536 + 33189121 = 6256^2 + 5761^2 .

It is a cyclic number.

It is not a de Polignac number, because 72326657 - 2⁴ = 72326641 is a prime.

It is a super-2 number, since 2×72326657² = 10462290625591298, 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 72326657.

It is not an unprimeable number, because it can be changed into a prime (72326659) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2781782 + ... + 2781807.

It is an arithmetic number, because the mean of its divisors is an integer number (19472565).

Almost surely, 2^72326657 is an apocalyptic number.

It is an amenable number.

72326657 is a deficient number, since it is larger than the sum of its proper divisors (5563603).

72326657 is a wasteful number, since it uses less digits than its factorization.

72326657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5563602.

The product of its digits is 105840, while the sum is 38.

The square root of 72326657 is about 8504.5080398574. The cubic root of 72326657 is about 416.6449580868.

The spelling of 72326657 in words is "seventy-two million, three hundred twenty-six thousand, six hundred fifty-seven".