172788894 has 24 divisors (see below), whose sum is σ = 374682672. Its totient is φ = 57549120.

The previous prime is 172788887. The next prime is 172788899. The reversal of 172788894 is 498887271.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 172788894.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172788899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24022 + ... + 30374.

It is an arithmetic number, because the mean of its divisors is an integer number (15611778).

Almost surely, 2^172788894 is an apocalyptic number.

172788894 is an abundant number, since it is smaller than the sum of its proper divisors (201893778).

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

172788894 is a wasteful number, since it uses less digits than its factorization.

172788894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7872 (or 7869 counting only the distinct ones).

The product of its digits is 1806336, while the sum is 54.

The square root of 172788894 is about 13144.9189423138. The cubic root of 172788894 is about 556.9787270266.

The spelling of 172788894 in words is "one hundred seventy-two million, seven hundred eighty-eight thousand, eight hundred ninety-four".