690894985 has 64 divisors (see below), whose sum is σ = 982886400. Its totient is φ = 461260800.

The previous prime is 690894979. The next prime is 690894991. The reversal of 690894985 is 589498096.

It is an interprime number because it is at equal distance from previous prime (690894979) and next prime (690894991).

It is not a de Polignac number, because 690894985 - 2⁷ = 690894857 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 63 ways as a sum of consecutive naturals, for example, 4400527 + ... + 4400683.

It is an arithmetic number, because the mean of its divisors is an integer number (15357600).

Almost surely, 2^690894985 is an apocalyptic number.

It is an amenable number.

690894985 is a deficient number, since it is larger than the sum of its proper divisors (291991415).

690894985 is a wasteful number, since it uses less digits than its factorization.

690894985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322.

The product of its (nonzero) digits is 5598720, while the sum is 58.

The square root of 690894985 is about 26284.8813008543. The cubic root of 690894985 is about 884.0374844195.

The spelling of 690894985 in words is "six hundred ninety million, eight hundred ninety-four thousand, nine hundred eighty-five".