690985997 has 8 divisors (see below), whose sum is σ = 762289080. Its totient is φ = 622275840.

The previous prime is 690985969. The next prime is 690986011. The reversal of 690985997 is 799589096.

690985997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 20124196 + 670861801 = 4486^2 + 25901^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-690985997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690985907) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 647672 + ... + 648737.

It is an arithmetic number, because the mean of its divisors is an integer number (95286135).

Almost surely, 2^690985997 is an apocalyptic number.

It is an amenable number.

690985997 is a deficient number, since it is larger than the sum of its proper divisors (71303083).

690985997 is a wasteful number, since it uses less digits than its factorization.

690985997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1296463.

The product of its (nonzero) digits is 11022480, while the sum is 62.

The square root of 690985997 is about 26286.6125052278. The cubic root of 690985997 is about 884.0763009732.

The spelling of 690985997 in words is "six hundred ninety million, nine hundred eighty-five thousand, nine hundred ninety-seven".