694019664 has 280 divisors, whose sum is σ = 2276937600. Its totient is φ = 203233536.

The previous prime is 694019663. The next prime is 694019737. The reversal of 694019664 is 466910496.

694019664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (694019663) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 3487437 + ... + 3487635.

It is an arithmetic number, because the mean of its divisors is an integer number (8131920).

Almost surely, 2^694019664 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 694019664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1138468800).

694019664 is an abundant number, since it is smaller than the sum of its proper divisors (1582917936).

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

694019664 is a wasteful number, since it uses less digits than its factorization.

694019664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261 (or 240 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The square root of 694019664 is about 26344.2529596115. The cubic root of 694019664 is about 885.3682121930.

The spelling of 694019664 in words is "six hundred ninety-four million, nineteen thousand, six hundred sixty-four".