90018562 has 4 divisors (see below), whose sum is σ = 135027846. Its totient is φ = 45009280.

The previous prime is 90018517. The next prime is 90018569. The reversal of 90018562 is 26581009.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 57744801 + 32273761 = 7599^2 + 5681^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (90018569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22504639 + ... + 22504642.

Almost surely, 2^90018562 is an apocalyptic number.

90018562 is a deficient number, since it is larger than the sum of its proper divisors (45009284).

90018562 is a wasteful number, since it uses less digits than its factorization.

90018562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45009283.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 90018562 is about 9487.8112333667. The cubic root of 90018562 is about 448.1712813657.

The spelling of 90018562 in words is "ninety million, eighteen thousand, five hundred sixty-two".