877640779 has 2 divisors, whose sum is σ = 877640780. Its totient is φ = 877640778.

The previous prime is 877640689. The next prime is 877640791. The reversal of 877640779 is 977046778.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 877640779 - 2¹⁷ = 877509707 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (877680779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 438820389 + 438820390.

It is an arithmetic number, because the mean of its divisors is an integer number (438820390).

Almost surely, 2^877640779 is an apocalyptic number.

877640779 is a deficient number, since it is larger than the sum of its proper divisors (1).

877640779 is an equidigital number, since it uses as much as digits as its factorization.

877640779 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4148928, while the sum is 55.

The square root of 877640779 is about 29625.0025991560. The cubic root of 877640779 is about 957.4268399587.

The spelling of 877640779 in words is "eight hundred seventy-seven million, six hundred forty thousand, seven hundred seventy-nine".