691015064 has 16 divisors (see below), whose sum is σ = 1297930920. Its totient is φ = 344900160.

The previous prime is 691015051. The next prime is 691015067. The reversal of 691015064 is 460510196.

It is a self number, because there is not a number n which added to its sum of digits gives 691015064.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691015067) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 71069 + ... + 80204.

Almost surely, 2^691015064 is an apocalyptic number.

It is an amenable number.

691015064 is a deficient number, since it is larger than the sum of its proper divisors (606915856).

691015064 is a wasteful number, since it uses less digits than its factorization.

691015064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151850 (or 151846 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 691015064 is about 26287.1653854119. The cubic root of 691015064 is about 884.0886973101.

The spelling of 691015064 in words is "six hundred ninety-one million, fifteen thousand, sixty-four".