68878791 has 12 divisors (see below), whose sum is σ = 100610640. Its totient is φ = 45402720.

The previous prime is 68878753. The next prime is 68878841. The reversal of 68878791 is 19787886.

It is not a de Polignac number, because 68878791 - 2⁶ = 68878727 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68878751) 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 11 ways as a sum of consecutive naturals, for example, 42195 + ... + 43796.

It is an arithmetic number, because the mean of its divisors is an integer number (8384220).

Almost surely, 2^68878791 is an apocalyptic number.

68878791 is a deficient number, since it is larger than the sum of its proper divisors (31731849).

68878791 is a wasteful number, since it uses less digits than its factorization.

68878791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86086 (or 86083 counting only the distinct ones).

The product of its digits is 1354752, while the sum is 54.

The square root of 68878791 is about 8299.3247315670. The cubic root of 68878791 is about 409.9162847124.

The spelling of 68878791 in words is "sixty-eight million, eight hundred seventy-eight thousand, seven hundred ninety-one".