90215898 has 8 divisors (see below), whose sum is σ = 180431808. Its totient is φ = 30071964.

The previous prime is 90215891. The next prime is 90215899. The reversal of 90215898 is 89851209.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

90215898 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (90215891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7517986 + ... + 7517997.

It is an arithmetic number, because the mean of its divisors is an integer number (22553976).

Almost surely, 2^90215898 is an apocalyptic number.

90215898 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

90215898 is a wasteful number, since it uses less digits than its factorization.

90215898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15035988.

The product of its (nonzero) digits is 51840, while the sum is 42.

The square root of 90215898 is about 9498.2049883123. The cubic root of 90215898 is about 448.4985315801.

The spelling of 90215898 in words is "ninety million, two hundred fifteen thousand, eight hundred ninety-eight".