77825987 has 2 divisors, whose sum is σ = 77825988. Its totient is φ = 77825986.

The previous prime is 77825977. The next prime is 77826019. The reversal of 77825987 is 78952877.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 77825987 - 2⁴ = 77825971 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (77825977) 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, 38912993 + 38912994.

It is an arithmetic number, because the mean of its divisors is an integer number (38912994).

Almost surely, 2^77825987 is an apocalyptic number.

77825987 is a deficient number, since it is larger than the sum of its proper divisors (1).

77825987 is an equidigital number, since it uses as much as digits as its factorization.

77825987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1975680, while the sum is 53.

The square root of 77825987 is about 8821.9038194712. The cubic root of 77825987 is about 426.9478973406.

The spelling of 77825987 in words is "seventy-seven million, eight hundred twenty-five thousand, nine hundred eighty-seven".