68255136 has 120 divisors (see below), whose sum is σ = 212681700. Its totient is φ = 21399552.

The previous prime is 68255123. The next prime is 68255137. The reversal of 68255136 is 63155286.

It can be written as a sum of positive squares in 2 ways, for example, as 67963536 + 291600 = 8244^2 + 540^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 68255136.

It is not an unprimeable number, because it can be changed into a prime (68255137) by changing a digit.

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 19 ways as a sum of consecutive naturals, for example, 43290 + ... + 44838.

Almost surely, 2^68255136 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 68255136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106340850).

68255136 is an abundant number, since it is smaller than the sum of its proper divisors (144426564).

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

68255136 is a wasteful number, since it uses less digits than its factorization.

68255136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1588 (or 1571 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 68255136 is about 8261.6666599422. Note that the first 4 decimals coincide. The cubic root of 68255136 is about 408.6753520782.

The spelling of 68255136 in words is "sixty-eight million, two hundred fifty-five thousand, one hundred thirty-six".