172979635420 has 24 divisors (see below), whose sum is σ = 363317560704. Its totient is φ = 69180363456.

The previous prime is 172979635363. The next prime is 172979635421. The reversal of 172979635420 is 24536979271.

It is a super-2 number, since 2×172979635420² (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 (172979635421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 594207 + ... + 836086.

It is an arithmetic number, because the mean of its divisors is an integer number (15138231696).

Almost surely, 2^172979635420 is an apocalyptic number.

172979635420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172979635420 is an abundant number, since it is smaller than the sum of its proper divisors (190337925284).

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

172979635420 is a wasteful number, since it uses less digits than its factorization.

172979635420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1436349 (or 1436347 counting only the distinct ones).

The product of its (nonzero) digits is 5715360, while the sum is 55.

The spelling of 172979635420 in words is "one hundred seventy-two billion, nine hundred seventy-nine million, six hundred thirty-five thousand, four hundred twenty".