691680276 has 144 divisors (see below), whose sum is σ = 2158430400. Its totient is φ = 190766016.

The previous prime is 691680271. The next prime is 691680287. The reversal of 691680276 is 672086196.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691680271) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 151215 + ... + 155721.

It is an arithmetic number, because the mean of its divisors is an integer number (14989100).

Almost surely, 2^691680276 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 691680276, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1079215200).

691680276 is an abundant number, since it is smaller than the sum of its proper divisors (1466750124).

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

691680276 is a wasteful number, since it uses less digits than its factorization.

691680276 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4563 (or 4548 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 691680276 is about 26299.8151324301. The cubic root of 691680276 is about 884.3722983615.

The spelling of 691680276 in words is "six hundred ninety-one million, six hundred eighty thousand, two hundred seventy-six".