691469680 has 80 divisors (see below), whose sum is σ = 1775136384. Its totient is φ = 248387840.

The previous prime is 691469671. The next prime is 691469683. The reversal of 691469680 is 86964196.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691469683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68307 + ... + 77773.

Almost surely, 2^691469680 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 691469680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (887568192).

691469680 is an abundant number, since it is smaller than the sum of its proper divisors (1083666704).

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

691469680 is a wasteful number, since it uses less digits than its factorization.

691469680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9574 (or 9568 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 49.

The square root of 691469680 is about 26295.8110732489. The cubic root of 691469680 is about 884.2825342608.

The spelling of 691469680 in words is "six hundred ninety-one million, four hundred sixty-nine thousand, six hundred eighty".