172679978142 has 128 divisors (see below), whose sum is σ = 446087347200. Its totient is φ = 49101474240.

The previous prime is 172679978137. The next prime is 172679978161. The reversal of 172679978142 is 241879976271.

It is a super-2 number, since 2×172679978142² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a self number, because there is not a number n which added to its sum of digits gives 172679978142.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6447034 + ... + 6473762.

It is an arithmetic number, because the mean of its divisors is an integer number (3485057400).

Almost surely, 2^172679978142 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 172679978142, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (223043673600).

172679978142 is an abundant number, since it is smaller than the sum of its proper divisors (273407369058).

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

172679978142 is an equidigital number, since it uses as much as digits as its factorization.

172679978142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26970 (or 26952 counting only the distinct ones).

The product of its digits is 21337344, while the sum is 63.

The spelling of 172679978142 in words is "one hundred seventy-two billion, six hundred seventy-nine million, nine hundred seventy-eight thousand, one hundred forty-two".