90104987 has 4 divisors (see below), whose sum is σ = 102977136. Its totient is φ = 77232840.

The previous prime is 90104983. The next prime is 90104999. The reversal of 90104987 is 78940109.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78940109 = 191 ⋅413299.

It is a cyclic number.

It is not a de Polignac number, because 90104987 - 2² = 90104983 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 90104987.

It is not an unprimeable number, because it can be changed into a prime (90104983) 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, 6436064 + ... + 6436077.

It is an arithmetic number, because the mean of its divisors is an integer number (25744284).

Almost surely, 2^90104987 is an apocalyptic number.

90104987 is a deficient number, since it is larger than the sum of its proper divisors (12872149).

90104987 is a wasteful number, since it uses less digits than its factorization.

90104987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12872148.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 90104987 is about 9492.3646685112. The cubic root of 90104987 is about 448.3146622162.

The spelling of 90104987 in words is "ninety million, one hundred four thousand, nine hundred eighty-seven".