72227656 has 16 divisors (see below), whose sum is σ = 135580140. Its totient is φ = 36072960.

The previous prime is 72227653. The next prime is 72227657. The reversal of 72227656 is 65672227.

It can be written as a sum of positive squares in 2 ways, for example, as 48860100 + 23367556 = 6990^2 + 4834^2 .

It is not an unprimeable number, because it can be changed into a prime (72227653) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 3196 + ... + 12436.

Almost surely, 2^72227656 is an apocalyptic number.

It is an amenable number.

72227656 is a deficient number, since it is larger than the sum of its proper divisors (63352484).

72227656 is a wasteful number, since it uses less digits than its factorization.

72227656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10224 (or 10220 counting only the distinct ones).

The product of its digits is 70560, while the sum is 37.

The square root of 72227656 is about 8498.6855454241. The cubic root of 72227656 is about 416.4547695551.

It can be divided in two parts, 7222 and 7656, that added together give a triangular number (14878 = T₁₇₂).

The spelling of 72227656 in words is "seventy-two million, two hundred twenty-seven thousand, six hundred fifty-six".