90197538 has 24 divisors (see below), whose sum is σ = 186413904. Its totient is φ = 29094120.

The previous prime is 90197533. The next prime is 90197551. The reversal of 90197538 is 83579109.

It is a happy number.

It is a super-2 number, since 2×90197538² = 16271191722522888, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 90197538.

It is not an unprimeable number, because it can be changed into a prime (90197533) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2056 + ... + 13587.

It is an arithmetic number, because the mean of its divisors is an integer number (7767246).

Almost surely, 2^90197538 is an apocalyptic number.

90197538 is an abundant number, since it is smaller than the sum of its proper divisors (96216366).

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

90197538 is a wasteful number, since it uses less digits than its factorization.

90197538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15710 (or 15679 counting only the distinct ones).

The product of its (nonzero) digits is 68040, while the sum is 42.

The square root of 90197538 is about 9497.2384407258. The cubic root of 90197538 is about 448.4681046011.

The spelling of 90197538 in words is "ninety million, one hundred ninety-seven thousand, five hundred thirty-eight".