68431872 has 52 divisors (see below), whose sum is σ = 182495480. Its totient is φ = 22806528.

The previous prime is 68431807. The next prime is 68431889. The reversal of 68431872 is 27813486.

It is a super-2 number, since 2×68431872² = 9365842210848768, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 68431872.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9504 + ... + 15072.

Almost surely, 2^68431872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68431872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91247740).

68431872 is an abundant number, since it is smaller than the sum of its proper divisors (114063608).

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

68431872 is an equidigital number, since it uses as much as digits as its factorization.

68431872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5596 (or 5574 counting only the distinct ones).

The product of its digits is 64512, while the sum is 39.

The square root of 68431872 is about 8272.3558917638. The cubic root of 68431872 is about 409.0277817025.

The spelling of 68431872 in words is "sixty-eight million, four hundred thirty-one thousand, eight hundred seventy-two".