694880640 has 128 divisors (see below), whose sum is σ = 2461096800. Its totient is φ = 185296896.

The previous prime is 694880633. The next prime is 694880647. The reversal of 694880640 is 46088496.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (694880633) and next prime (694880647).

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (694880647) 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 15 ways as a sum of consecutive naturals, for example, 2827 + ... + 37386.

Almost surely, 2^694880640 is an apocalyptic number.

694880640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 694880640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1230548400).

694880640 is an abundant number, since it is smaller than the sum of its proper divisors (1766216160).

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

694880640 is a wasteful number, since it uses less digits than its factorization.

694880640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40241 (or 40223 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The square root of 694880640 is about 26360.5887642898. The cubic root of 694880640 is about 885.7341796235.

The spelling of 694880640 in words is "six hundred ninety-four million, eight hundred eighty thousand, six hundred forty".