691593048 has 96 divisors (see below), whose sum is σ = 2036979360. Its totient is φ = 211092480.

The previous prime is 691593041. The next prime is 691593079. The reversal of 691593048 is 840395196.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 691592994 and 691593012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691593041) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37653 + ... + 52923.

It is an arithmetic number, because the mean of its divisors is an integer number (21218535).

Almost surely, 2^691593048 is an apocalyptic number.

691593048 is a gapful number since it is divisible by the number (68) 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 691593048, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1018489680).

691593048 is an abundant number, since it is smaller than the sum of its proper divisors (1345386312).

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

691593048 is a wasteful number, since it uses less digits than its factorization.

691593048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15337 (or 15330 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The square root of 691593048 is about 26298.1567414905. The cubic root of 691593048 is about 884.3351206497.

The spelling of 691593048 in words is "six hundred ninety-one million, five hundred ninety-three thousand, forty-eight".