67981930 has 16 divisors (see below), whose sum is σ = 123452424. Its totient is φ = 26951680.

The previous prime is 67981909. The next prime is 67981933. The reversal of 67981930 is 3918976.

It can be written as a sum of positive squares in 4 ways, for example, as 52403121 + 15578809 = 7239^2 + 3947^2 .

It is not an unprimeable number, because it can be changed into a prime (67981933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28951 + ... + 31210.

Almost surely, 2^67981930 is an apocalyptic number.

67981930 is a deficient number, since it is larger than the sum of its proper divisors (55470494).

67981930 is a wasteful number, since it uses less digits than its factorization.

67981930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60281.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 67981930 is about 8245.1155237510. The cubic root of 67981930 is about 408.1293523281.

The spelling of 67981930 in words is "sixty-seven million, nine hundred eighty-one thousand, nine hundred thirty".