87919637 has 4 divisors (see below), whose sum is σ = 94682700. Its totient is φ = 81156576.

The previous prime is 87919603. The next prime is 87919661. The reversal of 87919637 is 73691978.

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 24542116 + 63377521 = 4954^2 + 7961^2 .

It is a cyclic number.

It is not a de Polignac number, because 87919637 - 2¹⁶ = 87854101 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 (87919697) 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, 3381512 + ... + 3381537.

It is an arithmetic number, because the mean of its divisors is an integer number (23670675).

Almost surely, 2^87919637 is an apocalyptic number.

It is an amenable number.

87919637 is a deficient number, since it is larger than the sum of its proper divisors (6763063).

87919637 is a wasteful number, since it uses less digits than its factorization.

87919637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6763062.

The product of its digits is 571536, while the sum is 50.

The square root of 87919637 is about 9376.5471789993. The cubic root of 87919637 is about 444.6605786103.

The spelling of 87919637 in words is "eighty-seven million, nine hundred nineteen thousand, six hundred thirty-seven".