68133440 has 28 divisors (see below), whose sum is σ = 162243516. Its totient is φ = 27253248.

The previous prime is 68133437. The next prime is 68133473. The reversal of 68133440 is 4433186.

It can be written as a sum of positive squares in 2 ways, for example, as 13017664 + 55115776 = 3608^2 + 7424^2 .

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106139 + ... + 106778.

Almost surely, 2^68133440 is an apocalyptic number.

It is an amenable number.

68133440 is an abundant number, since it is smaller than the sum of its proper divisors (94110076).

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

68133440 is a wasteful number, since it uses less digits than its factorization.

68133440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212934 (or 212924 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 68133440 is about 8254.2982742326. The cubic root of 68133440 is about 408.4323240033.

The spelling of 68133440 in words is "sixty-eight million, one hundred thirty-three thousand, four hundred forty".