72844840 has 16 divisors (see below), whose sum is σ = 163900980. Its totient is φ = 29137920.

The previous prime is 72844819. The next prime is 72844853. The reversal of 72844840 is 4844827.

It can be written as a sum of positive squares in 2 ways, for example, as 72352036 + 492804 = 8506^2 + 702^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 72844840.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 910521 + ... + 910600.

Almost surely, 2^72844840 is an apocalyptic number.

It is an amenable number.

72844840 is an abundant number, since it is smaller than the sum of its proper divisors (91056140).

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

72844840 is a wasteful number, since it uses less digits than its factorization.

72844840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1821132 (or 1821128 counting only the distinct ones).

The product of its (nonzero) digits is 57344, while the sum is 37.

The square root of 72844840 is about 8534.9188631176. The cubic root of 72844840 is about 417.6376062834.

The spelling of 72844840 in words is "seventy-two million, eight hundred forty-four thousand, eight hundred forty".