172720557884 has 48 divisors (see below), whose sum is σ = 347070080448. Its totient is φ = 73674306048.

The previous prime is 172720557859. The next prime is 172720557917. The reversal of 172720557884 is 488755027271.

It is a super-2 number, since 2×172720557884² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22262534 + ... + 22270290.

It is an arithmetic number, because the mean of its divisors is an integer number (7230626676).

Almost surely, 2^172720557884 is an apocalyptic number.

172720557884 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

172720557884 is an abundant number, since it is smaller than the sum of its proper divisors (174349522564).

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

172720557884 is a wasteful number, since it uses less digits than its factorization.

172720557884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11414 (or 11412 counting only the distinct ones).

The product of its (nonzero) digits is 8780800, while the sum is 56.

The spelling of 172720557884 in words is "one hundred seventy-two billion, seven hundred twenty million, five hundred fifty-seven thousand, eight hundred eighty-four".