72324771428 has 96 divisors (see below), whose sum is σ = 159253807104. Its totient is φ = 27974556288.

The previous prime is 72324771377. The next prime is 72324771443. The reversal of 72324771428 is 82417742327.

It is a super-2 number, since 2×72324771428² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25438175 + ... + 25441017.

It is an arithmetic number, because the mean of its divisors is an integer number (1658893824).

Almost surely, 2^72324771428 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 72324771428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79626903552).

72324771428 is an abundant number, since it is smaller than the sum of its proper divisors (86929035676).

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

72324771428 is a wasteful number, since it uses less digits than its factorization.

72324771428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4401 (or 4399 counting only the distinct ones).

The product of its digits is 1053696, while the sum is 47.

The spelling of 72324771428 in words is "seventy-two billion, three hundred twenty-four million, seven hundred seventy-one thousand, four hundred twenty-eight".