87909489 has 16 divisors (see below), whose sum is σ = 130659840. Its totient is φ = 58415760.

The previous prime is 87909467. The next prime is 87909509. The reversal of 87909489 is 98490978.

It is not a de Polignac number, because 87909489 - 2⁷ = 87909361 is a prime.

It is a super-2 number, since 2×87909489² = 15456156512482242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (87909439) 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, 3424 + ... + 13694.

It is an arithmetic number, because the mean of its divisors is an integer number (8166240).

Almost surely, 2^87909489 is an apocalyptic number.

It is an amenable number.

87909489 is a deficient number, since it is larger than the sum of its proper divisors (42750351).

87909489 is a wasteful number, since it uses less digits than its factorization.

87909489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10597 (or 10591 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 54.

The square root of 87909489 is about 9376.0060260220. The cubic root of 87909489 is about 444.6434698455.

The spelling of 87909489 in words is "eighty-seven million, nine hundred nine thousand, four hundred eighty-nine".