68332781 has 8 divisors (see below), whose sum is σ = 74711424. Its totient is φ = 61981920.

The previous prime is 68332777. The next prime is 68332811. The reversal of 68332781 is 18723386.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 68332781 - 2² = 68332777 is a prime.

It is a super-2 number, since 2×68332781² = 9338737918387922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68382781) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1616 + ... + 11801.

It is an arithmetic number, because the mean of its divisors is an integer number (9338928).

Almost surely, 2^68332781 is an apocalyptic number.

It is an amenable number.

68332781 is a deficient number, since it is larger than the sum of its proper divisors (6378643).

68332781 is a wasteful number, since it uses less digits than its factorization.

68332781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13891.

The product of its digits is 48384, while the sum is 38.

The square root of 68332781 is about 8266.3644366795. The cubic root of 68332781 is about 408.8302589705.

The spelling of 68332781 in words is "sixty-eight million, three hundred thirty-two thousand, seven hundred eighty-one".