690926879 has 2 divisors, whose sum is σ = 690926880. Its totient is φ = 690926878.

The previous prime is 690926851. The next prime is 690926891. The reversal of 690926879 is 978629096.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-690926879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690926779) 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 as a sum of consecutive naturals, namely, 345463439 + 345463440.

It is an arithmetic number, because the mean of its divisors is an integer number (345463440).

Almost surely, 2^690926879 is an apocalyptic number.

690926879 is a deficient number, since it is larger than the sum of its proper divisors (1).

690926879 is an equidigital number, since it uses as much as digits as its factorization.

690926879 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2939328, while the sum is 56.

The square root of 690926879 is about 26285.4879924265. The cubic root of 690926879 is about 884.0510875760.

The spelling of 690926879 in words is "six hundred ninety million, nine hundred twenty-six thousand, eight hundred seventy-nine".