87664837 has 4 divisors (see below), whose sum is σ = 94408300. Its totient is φ = 80921376.

The previous prime is 87664789. The next prime is 87664853. The reversal of 87664837 is 73846678.

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 18957316 + 68707521 = 4354^2 + 8289^2 .

It is a cyclic number.

It is not a de Polignac number, because 87664837 - 2²³ = 79276229 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 (87664867) 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, 3371712 + ... + 3371737.

It is an arithmetic number, because the mean of its divisors is an integer number (23602075).

Almost surely, 2^87664837 is an apocalyptic number.

It is an amenable number.

87664837 is a deficient number, since it is larger than the sum of its proper divisors (6743463).

87664837 is a wasteful number, since it uses less digits than its factorization.

87664837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6743462.

The product of its digits is 1354752, while the sum is 49.

The square root of 87664837 is about 9362.9502294950. The cubic root of 87664837 is about 444.2306058647.

The spelling of 87664837 in words is "eighty-seven million, six hundred sixty-four thousand, eight hundred thirty-seven".