7640679 has 8 divisors (see below), whose sum is σ = 10723840. Its totient is φ = 4825656.

The previous prime is 7640621. The next prime is 7640681. The reversal of 7640679 is 9760467.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 7640679 - 2¹² = 7636583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7640279) 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 in 7 ways as a sum of consecutive naturals, for example, 66967 + ... + 67080.

It is an arithmetic number, because the mean of its divisors is an integer number (1340480).

Almost surely, 2^7640679 is an apocalyptic number.

7640679 is a deficient number, since it is larger than the sum of its proper divisors (3083161).

7640679 is a wasteful number, since it uses less digits than its factorization.

7640679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134069.

The product of its (nonzero) digits is 63504, while the sum is 39.

The square root of 7640679 is about 2764.1778162774. The cubic root of 7640679 is about 196.9596746375.

It can be divided in two parts, 76 and 40679, that added together give a triangular number (40755 = T₂₈₅).

The spelling of 7640679 in words is "seven million, six hundred forty thousand, six hundred seventy-nine".