691427744 has 96 divisors (see below), whose sum is σ = 1621710720. Its totient is φ = 283917312.

The previous prime is 691427617. The next prime is 691427753. The reversal of 691427744 is 447724196.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 691427695 and 691427704.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1058522 + ... + 1059174.

It is an arithmetic number, because the mean of its divisors is an integer number (16892820).

Almost surely, 2^691427744 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 691427744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (810855360).

691427744 is an abundant number, since it is smaller than the sum of its proper divisors (930282976).

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

691427744 is a wasteful number, since it uses less digits than its factorization.

691427744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862 (or 854 counting only the distinct ones).

The product of its digits is 338688, while the sum is 44.

The square root of 691427744 is about 26295.0136717972. The cubic root of 691427744 is about 884.2646573516.

The spelling of 691427744 in words is "six hundred ninety-one million, four hundred twenty-seven thousand, seven hundred forty-four".