72563690 has 8 divisors (see below), whose sum is σ = 130614660. Its totient is φ = 29025472.

The previous prime is 72563683. The next prime is 72563707. The reversal of 72563690 is 9636527.

It can be written as a sum of positive squares in 2 ways, for example, as 64818601 + 7745089 = 8051^2 + 2783^2 .

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

It is a super-2 number, since 2×72563690² = 10530978212832200, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3628175 + ... + 3628194.

Almost surely, 2^72563690 is an apocalyptic number.

72563690 is a deficient number, since it is larger than the sum of its proper divisors (58050970).

72563690 is a wasteful number, since it uses less digits than its factorization.

72563690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7256376.

The product of its (nonzero) digits is 68040, while the sum is 38.

The square root of 72563690 is about 8518.4323675193. The cubic root of 72563690 is about 417.0996125608.

The spelling of 72563690 in words is "seventy-two million, five hundred sixty-three thousand, six hundred ninety".