691399296 has 192 divisors, whose sum is σ = 2303421120. Its totient is φ = 194973696.

The previous prime is 691399283. The next prime is 691399301. The reversal of 691399296 is 692993196.

It is a tau number, because it is divible by the number of its divisors (192).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 668796 + ... + 669828.

It is an arithmetic number, because the mean of its divisors is an integer number (11996985).

Almost surely, 2^691399296 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 691399296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1151710560).

691399296 is an abundant number, since it is smaller than the sum of its proper divisors (1612021824).

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

691399296 is a wasteful number, since it uses less digits than its factorization.

691399296 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1143 (or 1128 counting only the distinct ones).

The product of its digits is 1417176, while the sum is 54.

The square root of 691399296 is about 26294.4727271721. The cubic root of 691399296 is about 884.2525298342.

The spelling of 691399296 in words is "six hundred ninety-one million, three hundred ninety-nine thousand, two hundred ninety-six".