87990089 has 16 divisors (see below), whose sum is σ = 100319040. Its totient is φ = 76440000.

The previous prime is 87990047. The next prime is 87990101. The reversal of 87990089 is 98009978.

It is a cyclic number.

It is not a de Polignac number, because 87990089 - 2⁸ = 87989833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87990029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30854 + ... + 33584.

It is an arithmetic number, because the mean of its divisors is an integer number (6269940).

Almost surely, 2^87990089 is an apocalyptic number.

It is an amenable number.

87990089 is a deficient number, since it is larger than the sum of its proper divisors (12328951).

87990089 is a wasteful number, since it uses less digits than its factorization.

87990089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2872.

The product of its (nonzero) digits is 326592, while the sum is 50.

The square root of 87990089 is about 9380.3032466973. The cubic root of 87990089 is about 444.7793191031.

The spelling of 87990089 in words is "eighty-seven million, nine hundred ninety thousand, eighty-nine".