691779096 has 128 divisors (see below), whose sum is σ = 2123366400. Its totient is φ = 207567360.

The previous prime is 691779091. The next prime is 691779103. The reversal of 691779096 is 690977196.

691779096 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691779091) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 80361 + ... + 88551.

It is an arithmetic number, because the mean of its divisors is an integer number (16588800).

Almost surely, 2^691779096 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 691779096, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1061683200).

691779096 is an abundant number, since it is smaller than the sum of its proper divisors (1431587304).

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

691779096 is a wasteful number, since it uses less digits than its factorization.

691779096 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8246 (or 8236 counting only the distinct ones).

The product of its (nonzero) digits is 1285956, while the sum is 54.

The square root of 691779096 is about 26301.6937857622. The cubic root of 691779096 is about 884.4144129588.

The spelling of 691779096 in words is "six hundred ninety-one million, seven hundred seventy-nine thousand, ninety-six".