90197658 has 16 divisors (see below), whose sum is σ = 200439360. Its totient is φ = 30065868.

The previous prime is 90197641. The next prime is 90197659. The reversal of 90197658 is 85679109.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (90197659) 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, 835110 + ... + 835217.

It is an arithmetic number, because the mean of its divisors is an integer number (12527460).

Almost surely, 2^90197658 is an apocalyptic number.

90197658 is an abundant number, since it is smaller than the sum of its proper divisors (110241702).

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

90197658 is a wasteful number, since it uses less digits than its factorization.

90197658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1670338 (or 1670332 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The square root of 90197658 is about 9497.2447583497. The cubic root of 90197658 is about 448.4683034836.

The spelling of 90197658 in words is "ninety million, one hundred ninety-seven thousand, six hundred fifty-eight".