690297680 has 40 divisors (see below), whose sum is σ = 1614251592. Its totient is φ = 274517504.

The previous prime is 690297667. The next prime is 690297691. The reversal of 690297680 is 86792096.

It can be written as a sum of positive squares in 4 ways, for example, as 39639616 + 650658064 = 6296^2 + 25508^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11099 + ... + 38778.

Almost surely, 2^690297680 is an apocalyptic number.

It is an amenable number.

690297680 is an abundant number, since it is smaller than the sum of its proper divisors (923953912).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

690297680 is a wasteful number, since it uses less digits than its factorization.

690297680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50063 (or 50057 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 690297680 is about 26273.5167040882. The cubic root of 690297680 is about 883.7826496210.

The spelling of 690297680 in words is "six hundred ninety million, two hundred ninety-seven thousand, six hundred eighty".