678706730 has 32 divisors (see below), whose sum is σ = 1318878288. Its totient is φ = 249984000.

The previous prime is 678706729. The next prime is 678706751. The reversal of 678706730 is 37607876.

It can be written as a sum of positive squares in 8 ways, for example, as 6497401 + 672209329 = 2549^2 + 25927^2 .

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, 48530 + ... + 60930.

Almost surely, 2^678706730 is an apocalyptic number.

678706730 is a deficient number, since it is larger than the sum of its proper divisors (640171558).

678706730 is a wasteful number, since it uses less digits than its factorization.

678706730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12842.

The product of its (nonzero) digits is 296352, while the sum is 44.

The square root of 678706730 is about 26052.0004990020. Note that the first 3 decimals coincide. The cubic root of 678706730 is about 878.8081014336.

The spelling of 678706730 in words is "six hundred seventy-eight million, seven hundred six thousand, seven hundred thirty".