172888420 has 48 divisors (see below), whose sum is σ = 375379200. Its totient is φ = 66835584.

The previous prime is 172888411. The next prime is 172888439. The reversal of 172888420 is 24888271.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 122881 + ... + 124279.

It is an arithmetic number, because the mean of its divisors is an integer number (7820400).

Almost surely, 2^172888420 is an apocalyptic number.

172888420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 172888420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (187689600).

172888420 is an abundant number, since it is smaller than the sum of its proper divisors (202490780).

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

172888420 is a wasteful number, since it uses less digits than its factorization.

172888420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1612 (or 1610 counting only the distinct ones).

The product of its (nonzero) digits is 57344, while the sum is 40.

The square root of 172888420 is about 13148.7041186575. The cubic root of 172888420 is about 557.0856459835.

The spelling of 172888420 in words is "one hundred seventy-two million, eight hundred eighty-eight thousand, four hundred twenty".