90561172 has 24 divisors (see below), whose sum is σ = 173018216. Its totient is φ = 41223168.

The previous prime is 90561167. The next prime is 90561179. The reversal of 90561172 is 27116509.

It can be written as a sum of positive squares in 4 ways, for example, as 197136 + 90364036 = 444^2 + 9506^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90561179) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8133 + ... + 15724.

Almost surely, 2^90561172 is an apocalyptic number.

It is an amenable number.

90561172 is a deficient number, since it is larger than the sum of its proper divisors (82457044).

90561172 is a wasteful number, since it uses less digits than its factorization.

90561172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23947 (or 23945 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 31.

The square root of 90561172 is about 9516.3633810400. The cubic root of 90561172 is about 449.0699672547.

The spelling of 90561172 in words is "ninety million, five hundred sixty-one thousand, one hundred seventy-two".