690944658 has 16 divisors (see below), whose sum is σ = 1387146816. Its totient is φ = 229438640.

The previous prime is 690944641. The next prime is 690944663. The reversal of 690944658 is 856449096.

It is a self number, because there is not a number n which added to its sum of digits gives 690944658.

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, 217353 + ... + 220508.

It is an arithmetic number, because the mean of its divisors is an integer number (86696676).

Almost surely, 2^690944658 is an apocalyptic number.

690944658 is an abundant number, since it is smaller than the sum of its proper divisors (696202158).

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

690944658 is a wasteful number, since it uses less digits than its factorization.

690944658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438129.

The product of its (nonzero) digits is 1866240, while the sum is 51.

The square root of 690944658 is about 26285.8261806625. The cubic root of 690944658 is about 884.0586703415.

The spelling of 690944658 in words is "six hundred ninety million, nine hundred forty-four thousand, six hundred fifty-eight".