172979554878 has 288 divisors, whose sum is σ = 444422474496. Its totient is φ = 48404708352.

The previous prime is 172979554789. The next prime is 172979554883. The reversal of 172979554878 is 878455979271.

172979554878 is a `hidden beast` number, since 1 + 7 + 2 + 9 + 7 + 9 + 5 + 548 + 78 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 237935751 + ... + 237936477.

It is an arithmetic number, because the mean of its divisors is an integer number (1543133592).

Almost surely, 2^172979554878 is an apocalyptic number.

172979554878 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 172979554878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (222211237248).

172979554878 is an abundant number, since it is smaller than the sum of its proper divisors (271442919618).

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

172979554878 is a wasteful number, since it uses less digits than its factorization.

172979554878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 928 (or 912 counting only the distinct ones).

The product of its digits is 355622400, while the sum is 72.

The spelling of 172979554878 in words is "one hundred seventy-two billion, nine hundred seventy-nine million, five hundred fifty-four thousand, eight hundred seventy-eight".