691944792 has 96 divisors (see below), whose sum is σ = 2173113600. Its totient is φ = 179720640.

The previous prime is 691944779. The next prime is 691944821. The reversal of 691944792 is 297449196.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3309 + ... + 37347.

It is an arithmetic number, because the mean of its divisors is an integer number (22636600).

Almost surely, 2^691944792 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 691944792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1086556800).

691944792 is an abundant number, since it is smaller than the sum of its proper divisors (1481168808).

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

691944792 is a wasteful number, since it uses less digits than its factorization.

691944792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34077 (or 34062 counting only the distinct ones).

The product of its digits is 979776, while the sum is 51.

The square root of 691944792 is about 26304.8435083731. The cubic root of 691944792 is about 884.4850194250.

The spelling of 691944792 in words is "six hundred ninety-one million, nine hundred forty-four thousand, seven hundred ninety-two".