172901220 has 96 divisors (see below), whose sum is σ = 515144448. Its totient is φ = 43180032.

The previous prime is 172901153. The next prime is 172901227. The reversal of 172901220 is 22109271.

It is not an unprimeable number, because it can be changed into a prime (172901227) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 343489 + ... + 343991.

It is an arithmetic number, because the mean of its divisors is an integer number (5366088).

Almost surely, 2^172901220 is an apocalyptic number.

172901220 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 172901220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (257572224).

172901220 is an abundant number, since it is smaller than the sum of its proper divisors (342243228).

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

172901220 is a wasteful number, since it uses less digits than its factorization.

172901220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 869 (or 867 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 172901220 is about 13149.1908496303. The cubic root of 172901220 is about 557.0993938106.

The spelling of 172901220 in words is "one hundred seventy-two million, nine hundred one thousand, two hundred twenty".