87196639 has 2 divisors, whose sum is σ = 87196640. Its totient is φ = 87196638.

The previous prime is 87196601. The next prime is 87196651. The reversal of 87196639 is 93669178.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87196639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 87196592 and 87196601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87196699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43598319 + 43598320.

It is an arithmetic number, because the mean of its divisors is an integer number (43598320).

Almost surely, 2^87196639 is an apocalyptic number.

87196639 is a deficient number, since it is larger than the sum of its proper divisors (1).

87196639 is an equidigital number, since it uses as much as digits as its factorization.

87196639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 489888, while the sum is 49.

The square root of 87196639 is about 9337.9140604313. The cubic root of 87196639 is about 443.4383488134.

The spelling of 87196639 in words is "eighty-seven million, one hundred ninety-six thousand, six hundred thirty-nine".