72172150520 has 32 divisors (see below), whose sum is σ = 162426010320. Its totient is φ = 28861985280.

The previous prime is 72172150507. The next prime is 72172150619. The reversal of 72172150520 is 2505127127.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43082 + ... + 382361.

Almost surely, 2^72172150520 is an apocalyptic number.

It is an amenable number.

72172150520 is an abundant number, since it is smaller than the sum of its proper divisors (90253859800).

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

72172150520 is a wasteful number, since it uses less digits than its factorization.

72172150520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429695 (or 429691 counting only the distinct ones).

The product of its (nonzero) digits is 9800, while the sum is 32.

Adding to 72172150520 its reverse (2505127127), we get a palindrome (74677277647).

The spelling of 72172150520 in words is "seventy-two billion, one hundred seventy-two million, one hundred fifty thousand, five hundred twenty".