72909798 has 32 divisors (see below), whose sum is σ = 157362912. Its totient is φ = 22387200.

The previous prime is 72909769. The next prime is 72909817. The reversal of 72909798 is 89790927.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 72909798.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68188 + ... + 69248.

It is an arithmetic number, because the mean of its divisors is an integer number (4917591).

Almost surely, 2^72909798 is an apocalyptic number.

72909798 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

72909798 is an abundant number, since it is smaller than the sum of its proper divisors (84453114).

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

72909798 is a wasteful number, since it uses less digits than its factorization.

72909798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1960.

The product of its (nonzero) digits is 571536, while the sum is 51.

The square root of 72909798 is about 8538.7234408897. The cubic root of 72909798 is about 417.7617095314.

The spelling of 72909798 in words is "seventy-two million, nine hundred nine thousand, seven hundred ninety-eight".