87994009 has 4 divisors (see below), whose sum is σ = 88012980. Its totient is φ = 87975040.

The previous prime is 87994007. The next prime is 87994079. The reversal of 87994009 is 90049978.

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

It can be written as a sum of positive squares in 2 ways, for example, as 13344409 + 74649600 = 3653^2 + 8640^2 .

It is a cyclic number.

It is not a de Polignac number, because 87994009 - 2¹ = 87994007 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 87994009.

It is not an unprimeable number, because it can be changed into a prime (87994007) 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, 2637 + ... + 13525.

It is an arithmetic number, because the mean of its divisors is an integer number (22003245).

Almost surely, 2^87994009 is an apocalyptic number.

It is an amenable number.

87994009 is a deficient number, since it is larger than the sum of its proper divisors (18971).

87994009 is a wasteful number, since it uses less digits than its factorization.

87994009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18970.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 87994009 is about 9380.5121928389. The cubic root of 87994009 is about 444.7859240479.

The spelling of 87994009 in words is "eighty-seven million, nine hundred ninety-four thousand, nine".