72724226 has 8 divisors (see below), whose sum is σ = 110935440. Its totient is φ = 35745748.

The previous prime is 72724213. The next prime is 72724231. The reversal of 72724226 is 62242727.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 72724192 and 72724201.

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, 308036 + ... + 308271.

It is an arithmetic number, because the mean of its divisors is an integer number (13866930).

Almost surely, 2^72724226 is an apocalyptic number.

72724226 is a deficient number, since it is larger than the sum of its proper divisors (38211214).

72724226 is a wasteful number, since it uses less digits than its factorization.

72724226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616368.

The product of its digits is 18816, while the sum is 32.

The square root of 72724226 is about 8527.8500221334. The cubic root of 72724226 is about 417.4069755813.

The spelling of 72724226 in words is "seventy-two million, seven hundred twenty-four thousand, two hundred twenty-six".