680646642 has 16 divisors (see below), whose sum is σ = 1466008320. Its totient is φ = 209429712.

The previous prime is 680646607. The next prime is 680646643. The reversal of 680646642 is 246646086.

It is a junction number, because it is equal to n+sod(n) for n = 680646594 and 680646603.

It is not an unprimeable number, because it can be changed into a prime (680646643) 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, 4363042 + ... + 4363197.

It is an arithmetic number, because the mean of its divisors is an integer number (91625520).

Almost surely, 2^680646642 is an apocalyptic number.

680646642 is an abundant number, since it is smaller than the sum of its proper divisors (785361678).

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

680646642 is a wasteful number, since it uses less digits than its factorization.

680646642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8726257.

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

The square root of 680646642 is about 26089.2054689291. The cubic root of 680646642 is about 879.6445887429.

The spelling of 680646642 in words is "six hundred eighty million, six hundred forty-six thousand, six hundred forty-two".