8640000779 has 2 divisors, whose sum is σ = 8640000780. Its totient is φ = 8640000778.

The previous prime is 8640000767. The next prime is 8640000833. The reversal of 8640000779 is 9770000468.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8640000779 is a prime.

It is a super-2 number, since 2×8640000779² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8640000709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4320000389 + 4320000390.

It is an arithmetic number, because the mean of its divisors is an integer number (4320000390).

Almost surely, 2^8640000779 is an apocalyptic number.

8640000779 is a deficient number, since it is larger than the sum of its proper divisors (1).

8640000779 is an equidigital number, since it uses as much as digits as its factorization.

8640000779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 8640000779 is about 92951.6044993307. The cubic root of 8640000779 is about 2051.9711976820.

The spelling of 8640000779 in words is "eight billion, six hundred forty million, seven hundred seventy-nine", and thus it is an aban number.