679402691 has 18 divisors (see below), whose sum is σ = 770448276. Its totient is φ = 594140400.

The previous prime is 679402667. The next prime is 679402699. The reversal of 679402691 is 196204976.

It is not a de Polignac number, because 679402691 - 2¹⁴ = 679386307 is a prime.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (679402699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2506886 + ... + 2507156.

It is an arithmetic number, because the mean of its divisors is an integer number (42802682).

Almost surely, 2^679402691 is an apocalyptic number.

679402691 is a deficient number, since it is larger than the sum of its proper divisors (91045585).

679402691 is an equidigital number, since it uses as much as digits as its factorization.

679402691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611 (or 311 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 679402691 is about 26065.3542274031. The cubic root of 679402691 is about 879.1083819535.

Multiplying 679402691 by its sum of digits (44), we get a square (29893718404 = 172898²).

The spelling of 679402691 in words is "six hundred seventy-nine million, four hundred two thousand, six hundred ninety-one".