72221744 has 20 divisors (see below), whose sum is σ = 159919824. Its totient is φ = 30952128.

The previous prime is 72221719. The next prime is 72221753. The reversal of 72221744 is 44712227.

It is a nude number because it is divisible by every one of its digits.

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, 322307 + ... + 322530.

Almost surely, 2^72221744 is an apocalyptic number.

It is an amenable number.

72221744 is an abundant number, since it is smaller than the sum of its proper divisors (87698080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72221744 is a wasteful number, since it uses less digits than its factorization.

72221744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644852 (or 644846 counting only the distinct ones).

The product of its digits is 6272, while the sum is 29.

The square root of 72221744 is about 8498.3377198132. The cubic root of 72221744 is about 416.4434066511.

The spelling of 72221744 in words is "seventy-two million, two hundred twenty-one thousand, seven hundred forty-four".