72513228 has 24 divisors (see below), whose sum is σ = 179150832. Its totient is φ = 22749184.

The previous prime is 72513209. The next prime is 72513239. The reversal of 72513228 is 82231527.

It is a junction number, because it is equal to n+sod(n) for n = 72513195 and 72513204.

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 7 ways as a sum of consecutive naturals, for example, 177525 + ... + 177932.

It is an arithmetic number, because the mean of its divisors is an integer number (7464618).

Almost surely, 2^72513228 is an apocalyptic number.

It is an amenable number.

72513228 is an abundant number, since it is smaller than the sum of its proper divisors (106637604).

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

72513228 is a wasteful number, since it uses less digits than its factorization.

72513228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355481 (or 355479 counting only the distinct ones).

The product of its digits is 6720, while the sum is 30.

The square root of 72513228 is about 8515.4699224412. The cubic root of 72513228 is about 417.0029041313.

The spelling of 72513228 in words is "seventy-two million, five hundred thirteen thousand, two hundred twenty-eight".