72213724 has 24 divisors (see below), whose sum is σ = 138958848. Its totient is φ = 32563440.

The previous prime is 72213703. The next prime is 72213749. The reversal of 72213724 is 42731227.

It is a junction number, because it is equal to n+sod(n) for n = 72213692 and 72213701.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 874 + ... + 12049.

It is an arithmetic number, because the mean of its divisors is an integer number (5789952).

Almost surely, 2^72213724 is an apocalyptic number.

It is an amenable number.

72213724 is a deficient number, since it is larger than the sum of its proper divisors (66745124).

72213724 is a wasteful number, since it uses less digits than its factorization.

72213724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13065 (or 13063 counting only the distinct ones).

The product of its digits is 4704, while the sum is 28.

The square root of 72213724 is about 8497.8658497296. The cubic root of 72213724 is about 416.4279911655.

The spelling of 72213724 in words is "seventy-two million, two hundred thirteen thousand, seven hundred twenty-four".