87679139 has 2 divisors, whose sum is σ = 87679140. Its totient is φ = 87679138.

The previous prime is 87679127. The next prime is 87679147. The reversal of 87679139 is 93197678.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87679139 - 2¹² = 87675043 is a prime.

It is not a weakly prime, because it can be changed into another prime (87679169) 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, 43839569 + 43839570.

It is an arithmetic number, because the mean of its divisors is an integer number (43839570).

Almost surely, 2^87679139 is an apocalyptic number.

87679139 is a deficient number, since it is larger than the sum of its proper divisors (1).

87679139 is an equidigital number, since it uses as much as digits as its factorization.

87679139 is an odious number, because the sum of its binary digits is odd.

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

The square root of 87679139 is about 9363.7139533414. The cubic root of 87679139 is about 444.2547624170.

The spelling of 87679139 in words is "eighty-seven million, six hundred seventy-nine thousand, one hundred thirty-nine".