72549906 has 48 divisors (see below), whose sum is σ = 171780672. Its totient is φ = 20291040.

The previous prime is 72549899. The next prime is 72549937. The reversal of 72549906 is 60994527.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5595 + ... + 13281.

It is an arithmetic number, because the mean of its divisors is an integer number (3578764).

Almost surely, 2^72549906 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 72549906, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85890336).

72549906 is an abundant number, since it is smaller than the sum of its proper divisors (99230766).

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

72549906 is a wasteful number, since it uses less digits than its factorization.

72549906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7727 (or 7716 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 42.

The square root of 72549906 is about 8517.6232600415. The cubic root of 72549906 is about 417.0732005213.

The spelling of 72549906 in words is "seventy-two million, five hundred forty-nine thousand, nine hundred six".