678018650 has 48 divisors (see below), whose sum is σ = 1342541304. Its totient is φ = 253870080.

The previous prime is 678018631. The next prime is 678018683. The reversal of 678018650 is 56810876.

It can be written as a sum of positive squares in 12 ways, for example, as 97160449 + 580858201 = 9857^2 + 24101^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 678018598 and 678018607.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 161984 + ... + 166116.

Almost surely, 2^678018650 is an apocalyptic number.

678018650 is a deficient number, since it is larger than the sum of its proper divisors (664522654).

678018650 is a wasteful number, since it uses less digits than its factorization.

678018650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4355 (or 4350 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 41.

The square root of 678018650 is about 26038.7912545878. The cubic root of 678018650 is about 878.5110193932.

The spelling of 678018650 in words is "six hundred seventy-eight million, eighteen thousand, six hundred fifty".