90561198 has 64 divisors (see below), whose sum is σ = 227727360. Its totient is φ = 23369472.

The previous prime is 90561179. The next prime is 90561203. The reversal of 90561198 is 89116509.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23898 + ... + 27426.

It is an arithmetic number, because the mean of its divisors is an integer number (3558240).

Almost surely, 2^90561198 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 90561198, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113863680).

90561198 is an abundant number, since it is smaller than the sum of its proper divisors (137166162).

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

90561198 is a wasteful number, since it uses less digits than its factorization.

90561198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3601.

The product of its (nonzero) digits is 19440, while the sum is 39.

The square root of 90561198 is about 9516.3647471080. The cubic root of 90561198 is about 449.0700102305.

The spelling of 90561198 in words is "ninety million, five hundred sixty-one thousand, one hundred ninety-eight".