68015844 has 144 divisors (see below), whose sum is σ = 200333952. Its totient is φ = 19270656.

The previous prime is 68015833. The next prime is 68015863. The reversal of 68015844 is 44851086.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 68015799 and 68015808.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 660297 + ... + 660399.

It is an arithmetic number, because the mean of its divisors is an integer number (1391208).

Almost surely, 2^68015844 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 68015844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100166976).

68015844 is an abundant number, since it is smaller than the sum of its proper divisors (132318108).

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

68015844 is a wasteful number, since it uses less digits than its factorization.

68015844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226 (or 221 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 68015844 is about 8247.1718788928. The cubic root of 68015844 is about 408.1972085846.

The spelling of 68015844 in words is "sixty-eight million, fifteen thousand, eight hundred forty-four".