691188468 has 24 divisors (see below), whose sum is σ = 1613357760. Its totient is φ = 230312640.

The previous prime is 691188461. The next prime is 691188469. The reversal of 691188468 is 864881196.

691188468 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 691188468.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691188461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30448 + ... + 48056.

It is an arithmetic number, because the mean of its divisors is an integer number (67223240).

Almost surely, 2^691188468 is an apocalyptic number.

It is an amenable number.

691188468 is an abundant number, since it is smaller than the sum of its proper divisors (922169292).

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

691188468 is a wasteful number, since it uses less digits than its factorization.

691188468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20887 (or 20885 counting only the distinct ones).

The product of its digits is 663552, while the sum is 51.

The square root of 691188468 is about 26290.4634420925. The cubic root of 691188468 is about 884.1626424876.

The spelling of 691188468 in words is "six hundred ninety-one million, one hundred eighty-eight thousand, four hundred sixty-eight".