680173978 has 16 divisors (see below), whose sum is σ = 1178483904. Its totient is φ = 290983360.

The previous prime is 680173933. The next prime is 680174021. The reversal of 680173978 is 879371086.

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, 908950 + ... + 909697.

It is an arithmetic number, because the mean of its divisors is an integer number (73655244).

Almost surely, 2^680173978 is an apocalyptic number.

680173978 is a deficient number, since it is larger than the sum of its proper divisors (498309926).

680173978 is a wasteful number, since it uses less digits than its factorization.

680173978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1818677.

The product of its (nonzero) digits is 508032, while the sum is 49.

The square root of 680173978 is about 26080.1452833377. The cubic root of 680173978 is about 879.4409232948.

The spelling of 680173978 in words is "six hundred eighty million, one hundred seventy-three thousand, nine hundred seventy-eight".