690668390 has 16 divisors (see below), whose sum is σ = 1247451408. Its totient is φ = 275323296.

The previous prime is 690668389. The next prime is 690668399. The reversal of 690668390 is 93866096.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690668399) 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, 114932 + ... + 120791.

It is an arithmetic number, because the mean of its divisors is an integer number (77965713).

Almost surely, 2^690668390 is an apocalyptic number.

690668390 is a deficient number, since it is larger than the sum of its proper divisors (556783018).

690668390 is a wasteful number, since it uses less digits than its factorization.

690668390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236023.

The product of its (nonzero) digits is 419904, while the sum is 47.

The square root of 690668390 is about 26280.5705798029. The cubic root of 690668390 is about 883.9408270009.

The spelling of 690668390 in words is "six hundred ninety million, six hundred sixty-eight thousand, three hundred ninety".