679642655 has 4 divisors (see below), whose sum is σ = 815571192. Its totient is φ = 543714120.

The previous prime is 679642589. The next prime is 679642657. The reversal of 679642655 is 556246976.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 679642655 - 2¹² = 679638559 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 (679642657) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67964261 + ... + 67964270.

It is an arithmetic number, because the mean of its divisors is an integer number (203892798).

Almost surely, 2^679642655 is an apocalyptic number.

679642655 is a deficient number, since it is larger than the sum of its proper divisors (135928537).

679642655 is a wasteful number, since it uses less digits than its factorization.

679642655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135928536.

The product of its digits is 2721600, while the sum is 50.

The square root of 679642655 is about 26069.9569428106. The cubic root of 679642655 is about 879.2118696863.

The spelling of 679642655 in words is "six hundred seventy-nine million, six hundred forty-two thousand, six hundred fifty-five".