72556226 has 4 divisors (see below), whose sum is σ = 108834342. Its totient is φ = 36278112.

The previous prime is 72556219. The next prime is 72556229. The reversal of 72556226 is 62265527.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 62265527 = 19 ⋅3277133.

It can be written as a sum of positive squares in only one way, i.e., 71995225 + 561001 = 8485^2 + 749^2 .

It is not an unprimeable number, because it can be changed into a prime (72556229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18139055 + ... + 18139058.

Almost surely, 2^72556226 is an apocalyptic number.

72556226 is a deficient number, since it is larger than the sum of its proper divisors (36278116).

72556226 is a wasteful number, since it uses less digits than its factorization.

72556226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36278115.

The product of its digits is 50400, while the sum is 35.

The square root of 72556226 is about 8517.9942474740. The cubic root of 72556226 is about 417.0853109257.

The spelling of 72556226 in words is "seventy-two million, five hundred fifty-six thousand, two hundred twenty-six".