691513944 has 64 divisors (see below), whose sum is σ = 1892125440. Its totient is φ = 208863360.

The previous prime is 691513937. The next prime is 691513957. The reversal of 691513944 is 449315196.

691513944 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 691513896 and 691513905.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79557 + ... + 87819.

It is an arithmetic number, because the mean of its divisors is an integer number (29564460).

Almost surely, 2^691513944 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 691513944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (946062720).

691513944 is an abundant number, since it is smaller than the sum of its proper divisors (1200611496).

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

691513944 is a wasteful number, since it uses less digits than its factorization.

691513944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8600 (or 8596 counting only the distinct ones).

The product of its digits is 116640, while the sum is 42.

The square root of 691513944 is about 26296.6527147468. The cubic root of 691513944 is about 884.3014027897.

The spelling of 691513944 in words is "six hundred ninety-one million, five hundred thirteen thousand, nine hundred forty-four".