690566705 has 16 divisors (see below), whose sum is σ = 880431120. Its totient is φ = 518982912.

The previous prime is 690566699. The next prime is 690566711. The reversal of 690566705 is 507665096.

It is an interprime number because it is at equal distance from previous prime (690566699) and next prime (690566711).

It can be written as a sum of positive squares in 8 ways, for example, as 24049216 + 666517489 = 4904^2 + 25817^2 .

It is a cyclic number.

It is not a de Polignac number, because 690566705 - 2⁴ = 690566689 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 58994 + ... + 69723.

It is an arithmetic number, because the mean of its divisors is an integer number (55026945).

Almost surely, 2^690566705 is an apocalyptic number.

It is an amenable number.

690566705 is a deficient number, since it is larger than the sum of its proper divisors (189864415).

690566705 is a wasteful number, since it uses less digits than its factorization.

690566705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128788.

The product of its (nonzero) digits is 340200, while the sum is 44.

The square root of 690566705 is about 26278.6359044757. The cubic root of 690566705 is about 883.8974449014.

The spelling of 690566705 in words is "six hundred ninety million, five hundred sixty-six thousand, seven hundred five".