172088403478 has 16 divisors (see below), whose sum is σ = 262822408560. Its totient is φ = 84489140736.

The previous prime is 172088403439. The next prime is 172088403481. The reversal of 172088403478 is 874304880271.

It is a super-2 number, since 2×172088403478² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2009563 + ... + 2093446.

It is an arithmetic number, because the mean of its divisors is an integer number (16426400535).

Almost surely, 2^172088403478 is an apocalyptic number.

172088403478 is a deficient number, since it is larger than the sum of its proper divisors (90734005082).

172088403478 is a wasteful number, since it uses less digits than its factorization.

172088403478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4103391.

The product of its (nonzero) digits is 2408448, while the sum is 52.

The spelling of 172088403478 in words is "one hundred seventy-two billion, eighty-eight million, four hundred three thousand, four hundred seventy-eight".