90587999 has 4 divisors (see below), whose sum is σ = 90611136. Its totient is φ = 90564864.

The previous prime is 90587993. The next prime is 90588013. The reversal of 90587999 is 99978509.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99978509 = 59 ⋅1694551.

It is a cyclic number.

It is not a de Polignac number, because 90587999 - 2⁸ = 90587743 is a prime.

It is a Duffinian number.

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 in 3 ways as a sum of consecutive naturals, for example, 4079 + ... + 14064.

It is an arithmetic number, because the mean of its divisors is an integer number (22652784).

Almost surely, 2^90587999 is an apocalyptic number.

90587999 is a deficient number, since it is larger than the sum of its proper divisors (23137).

90587999 is a wasteful number, since it uses less digits than its factorization.

90587999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23136.

The product of its (nonzero) digits is 1837080, while the sum is 56.

The square root of 90587999 is about 9517.7727961955. The cubic root of 90587999 is about 449.1143056481.

The spelling of 90587999 in words is "ninety million, five hundred eighty-seven thousand, nine hundred ninety-nine".