691489344 has 224 divisors, whose sum is σ = 2371425280. Its totient is φ = 172689408.

The previous prime is 691489343. The next prime is 691489349. The reversal of 691489344 is 443984196.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (224).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 691489293 and 691489302.

It is not an unprimeable number, because it can be changed into a prime (691489343) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 330927 + ... + 333009.

It is an arithmetic number, because the mean of its divisors is an integer number (10586720).

Almost surely, 2^691489344 is an apocalyptic number.

691489344 is a gapful number since it is divisible by the number (64) 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 691489344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1185712640).

691489344 is an abundant number, since it is smaller than the sum of its proper divisors (1679935936).

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

691489344 is a wasteful number, since it uses less digits than its factorization.

691489344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2137 (or 2127 counting only the distinct ones).

The product of its digits is 746496, while the sum is 48.

The square root of 691489344 is about 26296.1849704477. The cubic root of 691489344 is about 884.2909165840.

The spelling of 691489344 in words is "six hundred ninety-one million, four hundred eighty-nine thousand, three hundred forty-four".