691842816 has 288 divisors, whose sum is σ = 2380851200. Its totient is φ = 194088960.

The previous prime is 691842793. The next prime is 691842817. The reversal of 691842816 is 618248196.

It is a tau number, because it is divible by the number of its divisors (288).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691842817) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 3822246 + ... + 3822426.

Almost surely, 2^691842816 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 691842816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1190425600).

691842816 is an abundant number, since it is smaller than the sum of its proper divisors (1689008384).

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

691842816 is a wasteful number, since it uses less digits than its factorization.

691842816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292 (or 272 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 691842816 is about 26302.9050867010. The cubic root of 691842816 is about 884.4415666926.

The spelling of 691842816 in words is "six hundred ninety-one million, eight hundred forty-two thousand, eight hundred sixteen".