691488216 has 96 divisors (see below), whose sum is σ = 1902700800. Its totient is φ = 226848960.

The previous prime is 691488199. The next prime is 691488221. The reversal of 691488216 is 612884196.

691488216 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1574925 + ... + 1575363.

It is an arithmetic number, because the mean of its divisors is an integer number (19819800).

Almost surely, 2^691488216 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 691488216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (951350400).

691488216 is an abundant number, since it is smaller than the sum of its proper divisors (1211212584).

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

691488216 is a wasteful number, since it uses less digits than its factorization.

691488216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 749 (or 742 counting only the distinct ones).

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

The square root of 691488216 is about 26296.1635224608. The cubic root of 691488216 is about 884.2904357471.

The spelling of 691488216 in words is "six hundred ninety-one million, four hundred eighty-eight thousand, two hundred sixteen".