72224724 has 48 divisors (see below), whose sum is σ = 197991360. Its totient is φ = 20202240.

The previous prime is 72224717. The next prime is 72224749. The reversal of 72224724 is 42742227.

It is a junction number, because it is equal to n+sod(n) for n = 72224691 and 72224700.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19329 + ... + 22760.

It is an arithmetic number, because the mean of its divisors is an integer number (4124820).

Almost surely, 2^72224724 is an apocalyptic number.

It is an amenable number.

72224724 is an abundant number, since it is smaller than the sum of its proper divisors (125766636).

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

72224724 is a wasteful number, since it uses less digits than its factorization.

72224724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42120 (or 42118 counting only the distinct ones).

The product of its digits is 12544, while the sum is 30.

The square root of 72224724 is about 8498.5130464099. The cubic root of 72224724 is about 416.4491343088.

The spelling of 72224724 in words is "seventy-two million, two hundred twenty-four thousand, seven hundred twenty-four".