678021730 has 16 divisors (see below), whose sum is σ = 1221202944. Its totient is φ = 271038960.

The previous prime is 678021713. The next prime is 678021733. The reversal of 678021730 is 37120876.

It is not an unprimeable number, because it can be changed into a prime (678021733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3756 + ... + 37015.

It is an arithmetic number, because the mean of its divisors is an integer number (76325184).

Almost surely, 2^678021730 is an apocalyptic number.

678021730 is a deficient number, since it is larger than the sum of its proper divisors (543181214).

678021730 is a wasteful number, since it uses less digits than its factorization.

678021730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42441.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 678021730 is about 26038.8503970509. The cubic root of 678021730 is about 878.5123496466.

The spelling of 678021730 in words is "six hundred seventy-eight million, twenty-one thousand, seven hundred thirty".