915172220 has 48 divisors (see below), whose sum is σ = 2038696128. Its totient is φ = 343895040.

The previous prime is 915172189. The next prime is 915172243. The reversal of 915172220 is 22271519.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 206225 + ... + 210615.

It is an arithmetic number, because the mean of its divisors is an integer number (42472836).

Almost surely, 2^915172220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 915172220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1019348064).

915172220 is an abundant number, since it is smaller than the sum of its proper divisors (1123523908).

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

915172220 is a wasteful number, since it uses less digits than its factorization.

915172220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5030 (or 5028 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 915172220 is about 30251.8134993590. The cubic root of 915172220 is about 970.8845935509.

The spelling of 915172220 in words is "nine hundred fifteen million, one hundred seventy-two thousand, two hundred twenty".