691113600 has 384 divisors, whose sum is σ = 2668728000. Its totient is φ = 174182400.

The previous prime is 691113593. The next prime is 691113601. The reversal of 691113600 is 6311196.

It is a tau number, because it is divible by the number of its divisors (384).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691113601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1641390 + ... + 1641810.

Almost surely, 2^691113600 is an apocalyptic number.

691113600 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 691113600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1334364000).

691113600 is an abundant number, since it is smaller than the sum of its proper divisors (1977614400).

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

691113600 is a wasteful number, since it uses less digits than its factorization.

691113600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473 (or 450 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 691113600 is about 26289.0395412233. The cubic root of 691113600 is about 884.1307178236.

Adding to 691113600 its reverse (6311196), we get a palindrome (697424796).

The spelling of 691113600 in words is "six hundred ninety-one million, one hundred thirteen thousand, six hundred".