68306440 has 32 divisors (see below), whose sum is σ = 157846680. Its totient is φ = 26583552.

The previous prime is 68306431. The next prime is 68306467. The reversal of 68306440 is 4460386.

It can be written as a sum of positive squares in 4 ways, for example, as 68260644 + 45796 = 8262^2 + 214^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21597 + ... + 24556.

Almost surely, 2^68306440 is an apocalyptic number.

It is an amenable number.

68306440 is an abundant number, since it is smaller than the sum of its proper divisors (89540240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

68306440 is a wasteful number, since it uses less digits than its factorization.

68306440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46201 (or 46197 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 68306440 is about 8264.7710192116. The cubic root of 68306440 is about 408.7777200976. Note that the first 4 decimals are identical.

The spelling of 68306440 in words is "sixty-eight million, three hundred six thousand, four hundred forty".