72280018 has 16 divisors (see below), whose sum is σ = 112241664. Its totient is φ = 34881840.

The previous prime is 72279979. The next prime is 72280037. The reversal of 72280018 is 81008227.

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, 5553 + ... + 13243.

It is an arithmetic number, because the mean of its divisors is an integer number (7015104).

Almost surely, 2^72280018 is an apocalyptic number.

72280018 is a deficient number, since it is larger than the sum of its proper divisors (39961646).

72280018 is a wasteful number, since it uses less digits than its factorization.

72280018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7857.

The product of its (nonzero) digits is 1792, while the sum is 28.

The square root of 72280018 is about 8501.7655813366. The cubic root of 72280018 is about 416.5553826185. Note that the first 3 decimals are identical.

The spelling of 72280018 in words is "seventy-two million, two hundred eighty thousand, eighteen".