679787 has 4 divisors (see below), whose sum is σ = 695640. Its totient is φ = 663936.

The previous prime is 679781. The next prime is 679793. The reversal of 679787 is 787976.

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

It is an interprime number because it is at equal distance from previous prime (679781) and next prime (679793).

It is a cyclic number.

It is not a de Polignac number, because 679787 - 2⁸ = 679531 is a prime.

It is a super-2 number, since 2×679787² = 924220730738, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 679787.

It is not an unprimeable number, because it can be changed into a prime (679781) 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 3 ways as a sum of consecutive naturals, for example, 7862 + ... + 7947.

It is an arithmetic number, because the mean of its divisors is an integer number (173910).

2⁶⁷⁹⁷⁸⁷ is an apocalyptic number.

679787 is a deficient number, since it is larger than the sum of its proper divisors (15853).

679787 is a wasteful number, since it uses less digits than its factorization.

679787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15852.

The product of its digits is 148176, while the sum is 44.

The square root of 679787 is about 824.4919647880. The cubic root of 679787 is about 87.9274108694.

The spelling of 679787 in words is "six hundred seventy-nine thousand, seven hundred eighty-seven".