691994896 has 80 divisors (see below), whose sum is σ = 1473794560. Its totient is φ = 313528320.

The previous prime is 691994887. The next prime is 691994899. The reversal of 691994896 is 698499196.

It is not an unprimeable number, because it can be changed into a prime (691994899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 913750 + ... + 914506.

It is an arithmetic number, because the mean of its divisors is an integer number (18422432).

Almost surely, 2^691994896 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 691994896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (736897280).

691994896 is an abundant number, since it is smaller than the sum of its proper divisors (781799664).

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

691994896 is a wasteful number, since it uses less digits than its factorization.

691994896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 912 (or 906 counting only the distinct ones).

The product of its digits is 7558272, while the sum is 61.

The square root of 691994896 is about 26305.7958632694. The cubic root of 691994896 is about 884.5063675481.

The spelling of 691994896 in words is "six hundred ninety-one million, nine hundred ninety-four thousand, eight hundred ninety-six".