694780640 has 48 divisors (see below), whose sum is σ = 1649743200. Its totient is φ = 276503040.

The previous prime is 694780631. The next prime is 694780661. The reversal of 694780640 is 46087496.

It is a junction number, because it is equal to n+sod(n) for n = 694780591 and 694780600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20930 + ... + 42750.

It is an arithmetic number, because the mean of its divisors is an integer number (34369650).

Almost surely, 2^694780640 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 694780640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (824871600).

694780640 is an abundant number, since it is smaller than the sum of its proper divisors (954962560).

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

694780640 is a wasteful number, since it uses less digits than its factorization.

694780640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22035 (or 22027 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 44.

The square root of 694780640 is about 26358.6919250558. The cubic root of 694780640 is about 885.6916890325.

The spelling of 694780640 in words is "six hundred ninety-four million, seven hundred eighty thousand, six hundred forty".