72018906 has 16 divisors (see below), whose sum is σ = 145173504. Its totient is φ = 23817024.

The previous prime is 72018901. The next prime is 72018907. The reversal of 72018906 is 60981027.

It is not an unprimeable number, because it can be changed into a prime (72018901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46495 + ... + 48018.

It is an arithmetic number, because the mean of its divisors is an integer number (9073344).

Almost surely, 2^72018906 is an apocalyptic number.

72018906 is an abundant number, since it is smaller than the sum of its proper divisors (73154598).

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

72018906 is a wasteful number, since it uses less digits than its factorization.

72018906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94645.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 72018906 is about 8486.3953478494. The cubic root of 72018906 is about 416.0531744466.

The spelling of 72018906 in words is "seventy-two million, eighteen thousand, nine hundred six".