691893472 has 48 divisors (see below), whose sum is σ = 1466806320. Its totient is φ = 320063488.

The previous prime is 691893469. The next prime is 691893479. The reversal of 691893472 is 274398196.

691893472 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691893479) 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, 21318 + ... + 42874.

It is an arithmetic number, because the mean of its divisors is an integer number (30558465).

Almost surely, 2^691893472 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 691893472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (733403160).

691893472 is an abundant number, since it is smaller than the sum of its proper divisors (774912848).

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

691893472 is a wasteful number, since it uses less digits than its factorization.

691893472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21643 (or 21635 counting only the distinct ones).

The product of its digits is 653184, while the sum is 49.

The square root of 691893472 is about 26303.8680045350. The cubic root of 691893472 is about 884.4631521248.

The spelling of 691893472 in words is "six hundred ninety-one million, eight hundred ninety-three thousand, four hundred seventy-two".