690291684 has 36 divisors (see below), whose sum is σ = 1792067004. Its totient is φ = 223877952.

The previous prime is 690291559. The next prime is 690291691. The reversal of 690291684 is 486192096.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 431725284 + 258566400 = 20778^2 + 16080^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 257787 + ... + 260450.

It is an arithmetic number, because the mean of its divisors is an integer number (49779639).

Almost surely, 2^690291684 is an apocalyptic number.

It is an amenable number.

690291684 is an abundant number, since it is smaller than the sum of its proper divisors (1101775320).

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

690291684 is a wasteful number, since it uses less digits than its factorization.

690291684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518284 (or 518279 counting only the distinct ones).

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

The square root of 690291684 is about 26273.4025965424. The cubic root of 690291684 is about 883.7800907365.

The spelling of 690291684 in words is "six hundred ninety million, two hundred ninety-one thousand, six hundred eighty-four".