72172424380 has 72 divisors (see below), whose sum is σ = 176807222928. Its totient is φ = 24674614272.

The previous prime is 72172424341. The next prime is 72172424411. The reversal of 72172424380 is 8342427127.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 241627 + ... + 450253.

It is an arithmetic number, because the mean of its divisors is an integer number (2455655874).

Almost surely, 2^72172424380 is an apocalyptic number.

72172424380 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 72172424380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88403611464).

72172424380 is an abundant number, since it is smaller than the sum of its proper divisors (104634798548).

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

72172424380 is a wasteful number, since it uses less digits than its factorization.

72172424380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209003 (or 208994 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 40.

The spelling of 72172424380 in words is "seventy-two billion, one hundred seventy-two million, four hundred twenty-four thousand, three hundred eighty".