691734318 has 32 divisors (see below), whose sum is σ = 1598019840. Its totient is φ = 197285760.

The previous prime is 691734293. The next prime is 691734319. The reversal of 691734318 is 813437196.

691734318 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 691734318.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691734319) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 307138 + ... + 309381.

It is an arithmetic number, because the mean of its divisors is an integer number (49938120).

Almost surely, 2^691734318 is an apocalyptic number.

691734318 is an abundant number, since it is smaller than the sum of its proper divisors (906285522).

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

691734318 is a wasteful number, since it uses less digits than its factorization.

691734318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 616552.

The product of its digits is 108864, while the sum is 42.

The square root of 691734318 is about 26300.8425340330. The cubic root of 691734318 is about 884.3953301989.

The spelling of 691734318 in words is "six hundred ninety-one million, seven hundred thirty-four thousand, three hundred eighteen".