68312890 has 16 divisors (see below), whose sum is σ = 123213960. Its totient is φ = 27269440.

The previous prime is 68312879. The next prime is 68312891. The reversal of 68312890 is 9821386.

It can be written as a sum of positive squares in 4 ways, for example, as 68277169 + 35721 = 8263^2 + 189^2 .

It is not an unprimeable number, because it can be changed into a prime (68312891) 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, 1621 + ... + 11800.

Almost surely, 2^68312890 is an apocalyptic number.

68312890 is a deficient number, since it is larger than the sum of its proper divisors (54901070).

68312890 is a wasteful number, since it uses less digits than its factorization.

68312890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13937.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 68312890 is about 8265.1612204482. The cubic root of 68312890 is about 408.7905862993.

The spelling of 68312890 in words is "sixty-eight million, three hundred twelve thousand, eight hundred ninety".