68681440 has 24 divisors (see below), whose sum is σ = 162260280. Its totient is φ = 27472512.

The previous prime is 68681419. The next prime is 68681471. The reversal of 68681440 is 4418686.

It is a self number, because there is not a number n which added to its sum of digits gives 68681440.

It is a congruent number.

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, 214470 + ... + 214789.

It is an arithmetic number, because the mean of its divisors is an integer number (6760845).

Almost surely, 2^68681440 is an apocalyptic number.

It is an amenable number.

68681440 is an abundant number, since it is smaller than the sum of its proper divisors (93578840).

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

68681440 is a wasteful number, since it uses less digits than its factorization.

68681440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429274 (or 429266 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 37.

The square root of 68681440 is about 8287.4266210929. The cubic root of 68681440 is about 409.5244138479.

The spelling of 68681440 in words is "sixty-eight million, six hundred eighty-one thousand, four hundred forty".