691349320 has 32 divisors (see below), whose sum is σ = 1588636800. Its totient is φ = 270655168.

The previous prime is 691349297. The next prime is 691349377. The reversal of 691349320 is 23943196.

It is a self number, because there is not a number n which added to its sum of digits gives 691349320.

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 7 ways as a sum of consecutive naturals, for example, 181990 + ... + 185749.

It is an arithmetic number, because the mean of its divisors is an integer number (49644900).

Almost surely, 2^691349320 is an apocalyptic number.

It is an amenable number.

691349320 is an abundant number, since it is smaller than the sum of its proper divisors (897287480).

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

691349320 is a wasteful number, since it uses less digits than its factorization.

691349320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367797 (or 367793 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 37.

The square root of 691349320 is about 26293.5223962101. The cubic root of 691349320 is about 884.2312240227.

The spelling of 691349320 in words is "six hundred ninety-one million, three hundred forty-nine thousand, three hundred twenty".