87861637 has 2 divisors, whose sum is σ = 87861638. Its totient is φ = 87861636.

The previous prime is 87861623. The next prime is 87861649. The reversal of 87861637 is 73616878.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49928356 + 37933281 = 7066^2 + 6159^2 .

It is a cyclic number.

It is not a de Polignac number, because 87861637 - 2¹⁵ = 87828869 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87861607) 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 as a sum of consecutive naturals, namely, 43930818 + 43930819.

It is an arithmetic number, because the mean of its divisors is an integer number (43930819).

Almost surely, 2^87861637 is an apocalyptic number.

It is an amenable number.

87861637 is a deficient number, since it is larger than the sum of its proper divisors (1).

87861637 is an equidigital number, since it uses as much as digits as its factorization.

87861637 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 338688, while the sum is 46.

The square root of 87861637 is about 9373.4538458351. The cubic root of 87861637 is about 444.5627772250.

The spelling of 87861637 in words is "eighty-seven million, eight hundred sixty-one thousand, six hundred thirty-seven".