8640679 has 2 divisors, whose sum is σ = 8640680. Its totient is φ = 8640678.

The previous prime is 8640601. The next prime is 8640683. The reversal of 8640679 is 9760468.

8640679 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8640679 - 2¹³ = 8632487 is a prime.

It is a super-2 number, since 2×8640679² = 149322667162082, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8640689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4320339 + 4320340.

It is an arithmetic number, because the mean of its divisors is an integer number (4320340).

Almost surely, 2^8640679 is an apocalyptic number.

8640679 is a deficient number, since it is larger than the sum of its proper divisors (1).

8640679 is an equidigital number, since it uses as much as digits as its factorization.

8640679 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 8640679 is about 2939.5031893162. The cubic root of 8640679 is about 205.2024888015.

The spelling of 8640679 in words is "eight million, six hundred forty thousand, six hundred seventy-nine".