172218880 has 40 divisors (see below), whose sum is σ = 412927812. Its totient is φ = 68886528.

The previous prime is 172218863. The next prime is 172218929. The reversal of 172218880 is 88812271.

It can be written as a sum of positive squares in 2 ways, for example, as 158558464 + 13660416 = 12592^2 + 3696^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31077 + ... + 36196.

Almost surely, 2^172218880 is an apocalyptic number.

172218880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172218880 is an abundant number, since it is smaller than the sum of its proper divisors (240708932).

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

172218880 is an frugal number, since it uses more digits than its factorization.

172218880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67296 (or 67280 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 37.

The square root of 172218880 is about 13123.2191172745. The cubic root of 172218880 is about 556.3655791476.

It can be divided in two parts, 1722 and 18880, that added together give a palindrome (20602).

The spelling of 172218880 in words is "one hundred seventy-two million, two hundred eighteen thousand, eight hundred eighty".