7640279 has 2 divisors, whose sum is σ = 7640280. Its totient is φ = 7640278.

The previous prime is 7640263. The next prime is 7640287. The reversal of 7640279 is 9720467.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 7640279 - 2⁴ = 7640263 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7640219) 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, 3820139 + 3820140.

It is an arithmetic number, because the mean of its divisors is an integer number (3820140).

Almost surely, 2^7640279 is an apocalyptic number.

7640279 is a deficient number, since it is larger than the sum of its proper divisors (1).

7640279 is an equidigital number, since it uses as much as digits as its factorization.

7640279 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 7640279 is about 2764.1054610850. The cubic root of 7640279 is about 196.9562375414.

The spelling of 7640279 in words is "seven million, six hundred forty thousand, two hundred seventy-nine".