682646640 has 80 divisors (see below), whose sum is σ = 2278999968. Its totient is φ = 168035328.

The previous prime is 682646639. The next prime is 682646651. The reversal of 682646640 is 46646286.

682646640 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 682646592 and 682646601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106279 + ... + 112518.

Almost surely, 2^682646640 is an apocalyptic number.

682646640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

682646640 is an abundant number, since it is smaller than the sum of its proper divisors (1596353328).

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

682646640 is a wasteful number, since it uses less digits than its factorization.

682646640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218826 (or 218820 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 42.

The square root of 682646640 is about 26127.5073437938. The cubic root of 682646640 is about 880.5053227205.

The spelling of 682646640 in words is "six hundred eighty-two million, six hundred forty-six thousand, six hundred forty".