90387998 has 8 divisors (see below), whose sum is σ = 135842808. Its totient is φ = 45107064.

The previous prime is 90387977. The next prime is 90388007. The reversal of 90387998 is 89978309.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42161 + ... + 44252.

It is an arithmetic number, because the mean of its divisors is an integer number (16980351).

Almost surely, 2^90387998 is an apocalyptic number.

90387998 is a deficient number, since it is larger than the sum of its proper divisors (45454810).

90387998 is a wasteful number, since it uses less digits than its factorization.

90387998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86938.

The product of its (nonzero) digits is 979776, while the sum is 53.

The square root of 90387998 is about 9507.2602783347. The cubic root of 90387998 is about 448.7835425718.

The spelling of 90387998 in words is "ninety million, three hundred eighty-seven thousand, nine hundred ninety-eight".