72844145620 has 12 divisors (see below), whose sum is σ = 152972705844. Its totient is φ = 29137658240.

The previous prime is 72844145593. The next prime is 72844145629. The reversal of 72844145620 is 2654144827.

It can be written as a sum of positive squares in 2 ways, for example, as 10247107984 + 62597037636 = 101228^2 + 250194^2 .

It is a super-2 number, since 2×72844145620² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72844145629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1821103621 + ... + 1821103660.

It is an arithmetic number, because the mean of its divisors is an integer number (12747725487).

Almost surely, 2^72844145620 is an apocalyptic number.

It is an amenable number.

72844145620 is an abundant number, since it is smaller than the sum of its proper divisors (80128560224).

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

72844145620 is a wasteful number, since it uses less digits than its factorization.

72844145620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3642207290 (or 3642207288 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 43.

The spelling of 72844145620 in words is "seventy-two billion, eight hundred forty-four million, one hundred forty-five thousand, six hundred twenty".