690611618 has 8 divisors (see below), whose sum is σ = 1038311148. Its totient is φ = 344507904.

The previous prime is 690611617. The next prime is 690611627. The reversal of 690611618 is 816116096.

It can be written as a sum of positive squares in 2 ways, for example, as 689430049 + 1181569 = 26257^2 + 1087^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (690611611) 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, 397871 + ... + 399602.

Almost surely, 2^690611618 is an apocalyptic number.

690611618 is a deficient number, since it is larger than the sum of its proper divisors (347699530).

690611618 is a wasteful number, since it uses less digits than its factorization.

690611618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 797908.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 690611618 is about 26279.4904440706. The cubic root of 690611618 is about 883.9166067603.

The spelling of 690611618 in words is "six hundred ninety million, six hundred eleven thousand, six hundred eighteen".