691368048 has 360 divisors, whose sum is σ = 2469841920. Its totient is φ = 186157440.

The previous prime is 691368047. The next prime is 691368049. The reversal of 691368048 is 840863196.

It is an interprime number because it is at equal distance from previous prime (691368047) and next prime (691368049).

It is a junction number, because it is equal to n+sod(n) for n = 691367994 and 691368012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691368043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 3619633 + ... + 3619823.

It is an arithmetic number, because the mean of its divisors is an integer number (6860672).

Almost surely, 2^691368048 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 691368048, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1234920960).

691368048 is an abundant number, since it is smaller than the sum of its proper divisors (1778473872).

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

691368048 is a wasteful number, since it uses less digits than its factorization.

691368048 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247 (or 222 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 691368048 is about 26293.8785271401. The cubic root of 691368048 is about 884.2392082801.

The spelling of 691368048 in words is "six hundred ninety-one million, three hundred sixty-eight thousand, forty-eight".