691825968 has 80 divisors (see below), whose sum is σ = 2032032640. Its totient is φ = 225239616.

The previous prime is 691825961. The next prime is 691825973. The reversal of 691825968 is 869528196.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (691825961) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46 + ... + 37197.

It is an arithmetic number, because the mean of its divisors is an integer number (25400408).

Almost surely, 2^691825968 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 691825968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1016016320).

691825968 is an abundant number, since it is smaller than the sum of its proper divisors (1340206672).

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

691825968 is a wasteful number, since it uses less digits than its factorization.

691825968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37303 (or 37291 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 54.

The square root of 691825968 is about 26302.5848159454. The cubic root of 691825968 is about 884.4343872234.

The spelling of 691825968 in words is "six hundred ninety-one million, eight hundred twenty-five thousand, nine hundred sixty-eight".