68907840 has 112 divisors (see below), whose sum is σ = 220553280. Its totient is φ = 18227200.

The previous prime is 68907833. The next prime is 68907859. The reversal of 68907840 is 4870986.

It is a happy number.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 68907792 and 68907801.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 171640 + ... + 172040.

Almost surely, 2^68907840 is an apocalyptic number.

68907840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68907840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110276640).

68907840 is an abundant number, since it is smaller than the sum of its proper divisors (151645440).

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

68907840 is a wasteful number, since it uses less digits than its factorization.

68907840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 600 (or 590 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 68907840 is about 8301.0746292272. The cubic root of 68907840 is about 409.9739027609.

The spelling of 68907840 in words is "sixty-eight million, nine hundred seven thousand, eight hundred forty".