690658668 has 72 divisors (see below), whose sum is σ = 2000412960. Its totient is φ = 196819200.

The previous prime is 690658663. The next prime is 690658679. The reversal of 690658668 is 866856096.

690658668 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (690658663) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 99718 + ... + 106418.

Almost surely, 2^690658668 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 690658668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1000206480).

690658668 is an abundant number, since it is smaller than the sum of its proper divisors (1309754292).

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

690658668 is a wasteful number, since it uses less digits than its factorization.

690658668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7127 (or 7122 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 54.

The square root of 690658668 is about 26280.3856136092. The cubic root of 690658668 is about 883.9366794663.

The spelling of 690658668 in words is "six hundred ninety million, six hundred fifty-eight thousand, six hundred sixty-eight".