72647444 has 12 divisors (see below), whose sum is σ = 127192800. Its totient is φ = 36306648.

The previous prime is 72647437. The next prime is 72647453. The reversal of 72647444 is 44474627.

It is a super-2 number, since 2×72647444² = 10555302239466272, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 72647398 and 72647407.

It is a congruent number.

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, 13817 + ... + 18335.

It is an arithmetic number, because the mean of its divisors is an integer number (10599400).

Almost surely, 2^72647444 is an apocalyptic number.

It is an amenable number.

72647444 is a deficient number, since it is larger than the sum of its proper divisors (54545356).

72647444 is a wasteful number, since it uses less digits than its factorization.

72647444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8542 (or 8540 counting only the distinct ones).

The product of its digits is 150528, while the sum is 38.

The square root of 72647444 is about 8523.3469951657. The cubic root of 72647444 is about 417.2600248792.

The spelling of 72647444 in words is "seventy-two million, six hundred forty-seven thousand, four hundred forty-four".