68328281 has 4 divisors (see below), whose sum is σ = 78089472. Its totient is φ = 58567092.

The previous prime is 68328277. The next prime is 68328283. The reversal of 68328281 is 18282386.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18282386 = 2 ⋅9141193.

It is a cyclic number.

It is not a de Polignac number, because 68328281 - 2² = 68328277 is a prime.

It is a super-2 number, since 2×68328281² = 9337507968829922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68328283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4880585 + ... + 4880598.

It is an arithmetic number, because the mean of its divisors is an integer number (19522368).

Almost surely, 2^68328281 is an apocalyptic number.

It is an amenable number.

68328281 is a deficient number, since it is larger than the sum of its proper divisors (9761191).

68328281 is an equidigital number, since it uses as much as digits as its factorization.

68328281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9761190.

The product of its digits is 36864, while the sum is 38.

The square root of 68328281 is about 8266.0922448277. The cubic root of 68328281 is about 408.8212843782.

The spelling of 68328281 in words is "sixty-eight million, three hundred twenty-eight thousand, two hundred eighty-one".