90177220 has 24 divisors (see below), whose sum is σ = 216425664. Its totient is φ = 30917856.

The previous prime is 90177187. The next prime is 90177293. The reversal of 90177220 is 2277109.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (28).

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, 321922 + ... + 322201.

It is an arithmetic number, because the mean of its divisors is an integer number (9017736).

Almost surely, 2^90177220 is an apocalyptic number.

It is an amenable number.

90177220 is an abundant number, since it is smaller than the sum of its proper divisors (126248444).

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

90177220 is a wasteful number, since it uses less digits than its factorization.

90177220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644139 (or 644137 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 28.

The square root of 90177220 is about 9496.1687011131. The cubic root of 90177220 is about 448.4344279272.

It can be divided in two parts, 90 and 177220, that added together give a triangular number (177310 = T₅₉₅).

The spelling of 90177220 in words is "ninety million, one hundred seventy-seven thousand, two hundred twenty".