90472221 has 20 divisors (see below), whose sum is σ = 154457952. Its totient is φ = 51698088.

The previous prime is 90472183. The next prime is 90472223. The reversal of 90472221 is 12227409.

It is not a de Polignac number, because 90472221 - 2⁶ = 90472157 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90472223) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 79215 + ... + 80348.

Almost surely, 2^90472221 is an apocalyptic number.

It is an amenable number.

90472221 is a deficient number, since it is larger than the sum of its proper divisors (63985731).

90472221 is a wasteful number, since it uses less digits than its factorization.

90472221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159582 (or 159573 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 90472221 is about 9511.6886513384. The cubic root of 90472221 is about 448.9228905799.

The spelling of 90472221 in words is "ninety million, four hundred seventy-two thousand, two hundred twenty-one".