76399987 has 2 divisors, whose sum is σ = 76399988. Its totient is φ = 76399986.

The previous prime is 76399979. The next prime is 76399991. The reversal of 76399987 is 78999367.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 76399987 - 2³ = 76399979 is a prime.

It is not a weakly prime, because it can be changed into another prime (76399907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38199993 + 38199994.

It is an arithmetic number, because the mean of its divisors is an integer number (38199994).

Almost surely, 2^76399987 is an apocalyptic number.

76399987 is a deficient number, since it is larger than the sum of its proper divisors (1).

76399987 is an equidigital number, since it uses as much as digits as its factorization.

76399987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5143824, while the sum is 58.

The square root of 76399987 is about 8740.7086097181. The cubic root of 76399987 is about 424.3241613701.

The spelling of 76399987 in words is "seventy-six million, three hundred ninety-nine thousand, nine hundred eighty-seven".