68391288 has 48 divisors (see below), whose sum is σ = 211688880. Its totient is φ = 19540224.

The previous prime is 68391277. The next prime is 68391293. The reversal of 68391288 is 88219386.

It is a nude number because it is divisible by every one of its digits.

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 11 ways as a sum of consecutive naturals, for example, 67345 + ... + 68352.

It is an arithmetic number, because the mean of its divisors is an integer number (4410185).

Almost surely, 2^68391288 is an apocalyptic number.

It is an amenable number.

68391288 is an abundant number, since it is smaller than the sum of its proper divisors (143297592).

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

68391288 is a wasteful number, since it uses less digits than its factorization.

68391288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135716 (or 135709 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 68391288 is about 8269.9025387244. The cubic root of 68391288 is about 408.9469067843.

The spelling of 68391288 in words is "sixty-eight million, three hundred ninety-one thousand, two hundred eighty-eight".