87796139 has 2 divisors, whose sum is σ = 87796140. Its totient is φ = 87796138.

The previous prime is 87796087. The next prime is 87796157. The reversal of 87796139 is 93169778.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87796139 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (87790139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43898069 + 43898070.

It is an arithmetic number, because the mean of its divisors is an integer number (43898070).

Almost surely, 2^87796139 is an apocalyptic number.

87796139 is a deficient number, since it is larger than the sum of its proper divisors (1).

87796139 is an equidigital number, since it uses as much as digits as its factorization.

87796139 is an evil number, because the sum of its binary digits is even.

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

The square root of 87796139 is about 9369.9593915876. The cubic root of 87796139 is about 444.4522807206.

The spelling of 87796139 in words is "eighty-seven million, seven hundred ninety-six thousand, one hundred thirty-nine".