72255658 has 4 divisors (see below), whose sum is σ = 108383490. Its totient is φ = 36127828.

The previous prime is 72255647. The next prime is 72255679. The reversal of 72255658 is 85655227.

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

It can be written as a sum of positive squares in only one way, i.e., 72131049 + 124609 = 8493^2 + 353^2 .

It is a super-2 number, since 2×72255658² = 10441760226025928, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 72255658.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18063913 + ... + 18063916.

Almost surely, 2^72255658 is an apocalyptic number.

72255658 is a deficient number, since it is larger than the sum of its proper divisors (36127832).

72255658 is a wasteful number, since it uses less digits than its factorization.

72255658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36127831.

The product of its digits is 168000, while the sum is 40.

The square root of 72255658 is about 8500.3328170137. The cubic root of 72255658 is about 416.5085811669.

The spelling of 72255658 in words is "seventy-two million, two hundred fifty-five thousand, six hundred fifty-eight".