87280987 has 4 divisors (see below), whose sum is σ = 88081840. Its totient is φ = 86480136.

The previous prime is 87280979. The next prime is 87280993. The reversal of 87280987 is 78908278.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 87280987 - 2³ = 87280979 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 87280987.

It is not an unprimeable number, because it can be changed into a prime (87280957) 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, 400263 + ... + 400480.

It is an arithmetic number, because the mean of its divisors is an integer number (22020460).

Almost surely, 2^87280987 is an apocalyptic number.

87280987 is a deficient number, since it is larger than the sum of its proper divisors (800853).

87280987 is a wasteful number, since it uses less digits than its factorization.

87280987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800852.

The product of its (nonzero) digits is 451584, while the sum is 49.

The square root of 87280987 is about 9342.4293949700. The cubic root of 87280987 is about 443.5812866007.

The spelling of 87280987 in words is "eighty-seven million, two hundred eighty thousand, nine hundred eighty-seven".