72709818 has 32 divisors (see below), whose sum is σ = 153618432. Its totient is φ = 22906800.

The previous prime is 72709801. The next prime is 72709829. The reversal of 72709818 is 81890727.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 72709818.

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, 3453 + ... + 12543.

It is an arithmetic number, because the mean of its divisors is an integer number (4800576).

Almost surely, 2^72709818 is an apocalyptic number.

72709818 is an abundant number, since it is smaller than the sum of its proper divisors (80908614).

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

72709818 is a wasteful number, since it uses less digits than its factorization.

72709818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9170.

The product of its (nonzero) digits is 56448, while the sum is 42.

The square root of 72709818 is about 8527.0052187154. The cubic root of 72709818 is about 417.3794084406.

The spelling of 72709818 in words is "seventy-two million, seven hundred nine thousand, eight hundred eighteen".