76691987 has 2 divisors, whose sum is σ = 76691988. Its totient is φ = 76691986.

The previous prime is 76691969. The next prime is 76692001. The reversal of 76691987 is 78919667.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 76691987 - 2⁸ = 76691731 is a prime.

It is not a weakly prime, because it can be changed into another prime (76691387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38345993 + 38345994.

It is an arithmetic number, because the mean of its divisors is an integer number (38345994).

Almost surely, 2^76691987 is an apocalyptic number.

76691987 is a deficient number, since it is larger than the sum of its proper divisors (1).

76691987 is an equidigital number, since it uses as much as digits as its factorization.

76691987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1143072, while the sum is 53.

The square root of 76691987 is about 8757.3961312710. The cubic root of 76691987 is about 424.8640617144.

The spelling of 76691987 in words is "seventy-six million, six hundred ninety-one thousand, nine hundred eighty-seven".