690649579 has 4 divisors (see below), whose sum is σ = 690766384. Its totient is φ = 690532776.

The previous prime is 690649567. The next prime is 690649591. The reversal of 690649579 is 975946096.

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 (690649567) and next prime (690649591).

It is a cyclic number.

It is not a de Polignac number, because 690649579 - 2¹⁵ = 690616811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (690649549) 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 3 ways as a sum of consecutive naturals, for example, 49032 + ... + 61525.

It is an arithmetic number, because the mean of its divisors is an integer number (172691596).

Almost surely, 2^690649579 is an apocalyptic number.

690649579 is a deficient number, since it is larger than the sum of its proper divisors (116805).

690649579 is a wasteful number, since it uses less digits than its factorization.

690649579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116804.

The product of its (nonzero) digits is 3674160, while the sum is 55.

The square root of 690649579 is about 26280.2126893981. The cubic root of 690649579 is about 883.9328019428.

The spelling of 690649579 in words is "six hundred ninety million, six hundred forty-nine thousand, five hundred seventy-nine".