691212096 has 224 divisors, whose sum is σ = 2200656000. Its totient is φ = 212004864.

The previous prime is 691212047. The next prime is 691212101. The reversal of 691212096 is 690212196.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 691212096.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1214500 + ... + 1215068.

Almost surely, 2^691212096 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 691212096, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1100328000).

691212096 is an abundant number, since it is smaller than the sum of its proper divisors (1509443904).

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

691212096 is a wasteful number, since it uses less digits than its factorization.

691212096 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646 (or 630 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 691212096 is about 26290.9128027157. The cubic root of 691212096 is about 884.1727172877.

It can be divided in two parts, 69121 and 2096, that added together give a palindrome (71217).

The spelling of 691212096 in words is "six hundred ninety-one million, two hundred twelve thousand, ninety-six".