72755224 has 8 divisors (see below), whose sum is σ = 136416060. Its totient is φ = 36377608.

The previous prime is 72755203. The next prime is 72755251. The reversal of 72755224 is 42255727.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 72755224.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4547194 + ... + 4547209.

Almost surely, 2^72755224 is an apocalyptic number.

It is an amenable number.

72755224 is a deficient number, since it is larger than the sum of its proper divisors (63660836).

72755224 is a wasteful number, since it uses less digits than its factorization.

72755224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9094409 (or 9094405 counting only the distinct ones).

The product of its digits is 39200, while the sum is 34.

The square root of 72755224 is about 8529.6672854221. The cubic root of 72755224 is about 417.4662723898.

The spelling of 72755224 in words is "seventy-two million, seven hundred fifty-five thousand, two hundred twenty-four".