172906220 has 24 divisors (see below), whose sum is σ = 374817408. Its totient is φ = 66931200.

The previous prime is 172906187. The next prime is 172906277. The reversal of 172906220 is 22609271.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138821 + ... + 140060.

It is an arithmetic number, because the mean of its divisors is an integer number (15617392).

Almost surely, 2^172906220 is an apocalyptic number.

172906220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172906220 is an abundant number, since it is smaller than the sum of its proper divisors (201911188).

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

172906220 is a wasteful number, since it uses less digits than its factorization.

172906220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278921 (or 278919 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 172906220 is about 13149.3809740231. The cubic root of 172906220 is about 557.1047638712.

The spelling of 172906220 in words is "one hundred seventy-two million, nine hundred six thousand, two hundred twenty".