690294681 has 24 divisors (see below), whose sum is σ = 1077947520. Its totient is φ = 424188576.

The previous prime is 690294679. The next prime is 690294691. The reversal of 690294681 is 186492096.

It is a happy number.

It is not a de Polignac number, because 690294681 - 2¹ = 690294679 is a prime.

It is a super-2 number, since 2×690294681² = 953013493233783522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (690294611) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48225 + ... + 60878.

It is an arithmetic number, because the mean of its divisors is an integer number (44914480).

Almost surely, 2^690294681 is an apocalyptic number.

It is an amenable number.

690294681 is a deficient number, since it is larger than the sum of its proper divisors (387652839).

690294681 is a wasteful number, since it uses less digits than its factorization.

690294681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109165 (or 109162 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 690294681 is about 26273.4596313466. The cubic root of 690294681 is about 883.7813697538.

The spelling of 690294681 in words is "six hundred ninety million, two hundred ninety-four thousand, six hundred eighty-one".