87045989 has 4 divisors (see below), whose sum is σ = 87353856. Its totient is φ = 86738124.

The previous prime is 87045971. The next prime is 87046009. The reversal of 87045989 is 98954078.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87045989 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 (87045919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153509 + ... + 154074.

It is an arithmetic number, because the mean of its divisors is an integer number (21838464).

Almost surely, 2^87045989 is an apocalyptic number.

It is an amenable number.

87045989 is a deficient number, since it is larger than the sum of its proper divisors (307867).

87045989 is a wasteful number, since it uses less digits than its factorization.

87045989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307866.

The product of its (nonzero) digits is 725760, while the sum is 50.

The square root of 87045989 is about 9329.8439965521. The cubic root of 87045989 is about 443.1828248334.

The spelling of 87045989 in words is "eighty-seven million, forty-five thousand, nine hundred eighty-nine".