691120400 has 60 divisors (see below), whose sum is σ = 1663041252. Its totient is φ = 276011520.

The previous prime is 691120379. The next prime is 691120457. The reversal of 691120400 is 4021196.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 692224 + 690428176 = 832^2 + 26276^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 397934 + ... + 399666.

Almost surely, 2^691120400 is an apocalyptic number.

It is an amenable number.

691120400 is an abundant number, since it is smaller than the sum of its proper divisors (971920852).

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

691120400 is a wasteful number, since it uses less digits than its factorization.

691120400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2748 (or 2737 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 691120400 is about 26289.1688723702. The cubic root of 691120400 is about 884.1336175250.

Adding to 691120400 its reverse (4021196), we get a palindrome (695141596).

The spelling of 691120400 in words is "six hundred ninety-one million, one hundred twenty thousand, four hundred".