694640 has 40 divisors (see below), whose sum is σ = 1703760. Its totient is φ = 262656.

The previous prime is 694633. The next prime is 694649. The reversal of 694640 is 46496.

It is a tau number, because it is divible by the number of its divisors (40).

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (694649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1292 + ... + 1748.

It is an arithmetic number, because the mean of its divisors is an integer number (42594).

2⁶⁹⁴⁶⁴⁰ 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 694640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (851880).

694640 is an abundant number, since it is smaller than the sum of its proper divisors (1009120).

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

694640 is a wasteful number, since it uses less digits than its factorization.

694640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489 (or 483 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 694640 is about 833.4506584076. The cubic root of 694640 is about 88.5631923366.

The spelling of 694640 in words is "six hundred ninety-four thousand, six hundred forty".