690668646 has 12 divisors (see below), whose sum is σ = 1381466052. Its totient is φ = 230201424.

The previous prime is 690668609. The next prime is 690668651. The reversal of 690668646 is 646866096.

It is a congruent number.

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 5 ways as a sum of consecutive naturals, for example, 59010 + ... + 69738.

It is an arithmetic number, because the mean of its divisors is an integer number (115122171).

Almost surely, 2^690668646 is an apocalyptic number.

690668646 is an abundant number, since it is smaller than the sum of its proper divisors (690797406).

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

690668646 is an frugal number, since it uses more digits than its factorization.

690668646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21463 (or 10734 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 51.

The square root of 690668646 is about 26280.5754503207. The cubic root of 690668646 is about 883.9409362134.

The spelling of 690668646 in words is "six hundred ninety million, six hundred sixty-eight thousand, six hundred forty-six".