68078931 has 8 divisors (see below), whose sum is σ = 96111504. Its totient is φ = 42716160.

The previous prime is 68078929. The next prime is 68078947. The reversal of 68078931 is 13987086.

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

It is not a de Polignac number, because 68078931 - 2¹ = 68078929 is a prime.

It is a super-2 number, since 2×68078931² = 9269481692205522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (68078951) 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, 667390 + ... + 667491.

It is an arithmetic number, because the mean of its divisors is an integer number (12013938).

Almost surely, 2^68078931 is an apocalyptic number.

68078931 is a deficient number, since it is larger than the sum of its proper divisors (28032573).

68078931 is a wasteful number, since it uses less digits than its factorization.

68078931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1334901.

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 68078931 is about 8250.9957580888. The cubic root of 68078931 is about 408.3233751655.

The spelling of 68078931 in words is "sixty-eight million, seventy-eight thousand, nine hundred thirty-one".