90587998 has 4 divisors (see below), whose sum is σ = 135882000. Its totient is φ = 45293998.

The previous prime is 90587993. The next prime is 90588013. The reversal of 90587998 is 89978509.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 89978509 = 19 ⋅4735711.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90587993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22646998 + ... + 22647001.

It is an arithmetic number, because the mean of its divisors is an integer number (33970500).

Almost surely, 2^90587998 is an apocalyptic number.

90587998 is a deficient number, since it is larger than the sum of its proper divisors (45294002).

90587998 is a wasteful number, since it uses less digits than its factorization.

90587998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45294001.

The product of its (nonzero) digits is 1632960, while the sum is 55.

The square root of 90587998 is about 9517.7727436622. The cubic root of 90587998 is about 449.1143039955.

The spelling of 90587998 in words is "ninety million, five hundred eighty-seven thousand, nine hundred ninety-eight".