8915220 has 36 divisors (see below), whose sum is σ = 27043380. Its totient is φ = 2377344.

The previous prime is 8915213. The next prime is 8915243. The reversal of 8915220 is 225198.

It can be written as a sum of positive squares in 2 ways, for example, as 1527696 + 7387524 = 1236^2 + 2718^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×8915220² = 158962295296800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24585 + ... + 24944.

It is an arithmetic number, because the mean of its divisors is an integer number (751205).

Almost surely, 2^8915220 is an apocalyptic number.

It is an amenable number.

8915220 is an abundant number, since it is smaller than the sum of its proper divisors (18128160).

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

8915220 is a wasteful number, since it uses less digits than its factorization.

8915220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49544 (or 49539 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 8915220 is about 2985.8365661905. The cubic root of 8915220 is about 207.3531743045.

The spelling of 8915220 in words is "eight million, nine hundred fifteen thousand, two hundred twenty".