690840884 has 24 divisors (see below), whose sum is σ = 1226803200. Its totient is φ = 340363296.

The previous prime is 690840851. The next prime is 690840889. The reversal of 690840884 is 488048096.

It is a super-2 number, since 2×690840884² = 954522254011802912, which contains 22 as substring.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690840889) 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, 71129 + ... + 80255.

It is an arithmetic number, because the mean of its divisors is an integer number (51116800).

Almost surely, 2^690840884 is an apocalyptic number.

It is an amenable number.

690840884 is a deficient number, since it is larger than the sum of its proper divisors (535962316).

690840884 is a wasteful number, since it uses less digits than its factorization.

690840884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9407 (or 9405 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 47.

The square root of 690840884 is about 26283.8521529855. The cubic root of 690840884 is about 884.0144087658.

The spelling of 690840884 in words is "six hundred ninety million, eight hundred forty thousand, eight hundred eighty-four".