691906848 has 48 divisors (see below), whose sum is σ = 1841154336. Its totient is φ = 227473920.

The previous prime is 691906847. The next prime is 691906867. The reversal of 691906848 is 848609196.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 691906848.

It is not an unprimeable number, because it can be changed into a prime (691906847) by changing a digit.

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, 42358 + ... + 56373.

It is an arithmetic number, because the mean of its divisors is an integer number (38357382).

Almost surely, 2^691906848 is an apocalyptic number.

It is an amenable number.

691906848 is an abundant number, since it is smaller than the sum of its proper divisors (1149247488).

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

691906848 is a wasteful number, since it uses less digits than its factorization.

691906848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98817 (or 98809 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 51.

The square root of 691906848 is about 26304.1222624896. The cubic root of 691906848 is about 884.4688517030.

The spelling of 691906848 in words is "six hundred ninety-one million, nine hundred six thousand, eight hundred forty-eight".