172390528178428 has 48 divisors (see below), whose sum is σ = 349800028530624. Its totient is φ = 72807874859520.

The previous prime is 172390528178399. The next prime is 172390528178441. The reversal of 172390528178428 is 824871825093271.

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, 33292975 + ... + 38120902.

It is an arithmetic number, because the mean of its divisors is an integer number (7287500594388).

Almost surely, 2^{172390528178428} is an apocalyptic number.

It is an amenable number.

172390528178428 is an abundant number, since it is smaller than the sum of its proper divisors (177409500352196).

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

172390528178428 is a wasteful number, since it uses less digits than its factorization.

172390528178428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71415142 (or 71415140 counting only the distinct ones).

The product of its (nonzero) digits is 108380160, while the sum is 67.

The spelling of 172390528178428 in words is "one hundred seventy-two trillion, three hundred ninety billion, five hundred twenty-eight million, one hundred seventy-eight thousand, four hundred twenty-eight".