690868685 has 16 divisors (see below), whose sum is σ = 896310576. Its totient is φ = 508182528.

The previous prime is 690868663. The next prime is 690868721. The reversal of 690868685 is 586868096.

It can be written as a sum of positive squares in 8 ways, for example, as 15856324 + 675012361 = 3982^2 + 25981^2 .

It is a cyclic number.

It is not a de Polignac number, because 690868685 - 2⁸ = 690868429 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 690868685.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3974 + ... + 37383.

It is an arithmetic number, because the mean of its divisors is an integer number (56019411).

Almost surely, 2^690868685 is an apocalyptic number.

690868685 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

690868685 is a deficient number, since it is larger than the sum of its proper divisors (205441891).

690868685 is a wasteful number, since it uses less digits than its factorization.

690868685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41632.

The product of its (nonzero) digits is 4976640, while the sum is 56.

The square root of 690868685 is about 26284.3810085001. The cubic root of 690868685 is about 884.0262668533.

The spelling of 690868685 in words is "six hundred ninety million, eight hundred sixty-eight thousand, six hundred eighty-five".