7640879 has 2 divisors, whose sum is σ = 7640880. Its totient is φ = 7640878.

The previous prime is 7640873. The next prime is 7640887. The reversal of 7640879 is 9780467.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7640879 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 (7640873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3820439 + 3820440.

It is an arithmetic number, because the mean of its divisors is an integer number (3820440).

Almost surely, 2^7640879 is an apocalyptic number.

7640879 is a deficient number, since it is larger than the sum of its proper divisors (1).

7640879 is an equidigital number, since it uses as much as digits as its factorization.

7640879 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 7640879 is about 2764.2139931633. The cubic root of 7640879 is about 196.9613931406.

The spelling of 7640879 in words is "seven million, six hundred forty thousand, eight hundred seventy-nine".