87209985 has 16 divisors (see below), whose sum is σ = 140019264. Its totient is φ = 46350912.

The previous prime is 87209929. The next prime is 87209987. The reversal of 87209985 is 58990278.

It is a happy number.

It is not a de Polignac number, because 87209985 - 2⁶ = 87209921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87209987) 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, 5527 + ... + 14316.

It is an arithmetic number, because the mean of its divisors is an integer number (8751204).

Almost surely, 2^87209985 is an apocalyptic number.

It is an amenable number.

87209985 is a deficient number, since it is larger than the sum of its proper divisors (52809279).

87209985 is a wasteful number, since it uses less digits than its factorization.

87209985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20144.

The product of its (nonzero) digits is 362880, while the sum is 48.

The square root of 87209985 is about 9338.6286466483. The cubic root of 87209985 is about 443.4609713455.

The spelling of 87209985 in words is "eighty-seven million, two hundred nine thousand, nine hundred eighty-five".