678660406 has 8 divisors (see below), whose sum is σ = 1018203624. Its totient is φ = 339259200.

The previous prime is 678660391. The next prime is 678660439. The reversal of 678660406 is 604066876.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22620 + ... + 43231.

It is an arithmetic number, because the mean of its divisors is an integer number (127275453).

Almost surely, 2^678660406 is an apocalyptic number.

678660406 is a deficient number, since it is larger than the sum of its proper divisors (339543218).

678660406 is a wasteful number, since it uses less digits than its factorization.

678660406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71006.

The product of its (nonzero) digits is 290304, while the sum is 43.

The square root of 678660406 is about 26051.1114158302. Note that the first 3 decimals coincide. The cubic root of 678660406 is about 878.7881071166.

The spelling of 678660406 in words is "six hundred seventy-eight million, six hundred sixty thousand, four hundred six".