690886667 has 4 divisors (see below), whose sum is σ = 690959016. Its totient is φ = 690814320.

The previous prime is 690886649. The next prime is 690886717. The reversal of 690886667 is 766688096.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-690886667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (690886967) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19193 + ... + 41834.

It is an arithmetic number, because the mean of its divisors is an integer number (172739754).

Almost surely, 2^690886667 is an apocalyptic number.

690886667 is a deficient number, since it is larger than the sum of its proper divisors (72349).

690886667 is a wasteful number, since it uses less digits than its factorization.

690886667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72348.

The product of its (nonzero) digits is 5225472, while the sum is 56.

The square root of 690886667 is about 26284.7230725378. The cubic root of 690886667 is about 884.0339366284.

The spelling of 690886667 in words is "six hundred ninety million, eight hundred eighty-six thousand, six hundred sixty-seven".