68778751 has 4 divisors (see below), whose sum is σ = 68796352. Its totient is φ = 68761152.

The previous prime is 68778737. The next prime is 68778761. The reversal of 68778751 is 15787786.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 68778751 - 2⁹ = 68778239 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68778695 and 68778704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68778761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15 + ... + 11728.

It is an arithmetic number, because the mean of its divisors is an integer number (17199088).

Almost surely, 2^68778751 is an apocalyptic number.

68778751 is a deficient number, since it is larger than the sum of its proper divisors (17601).

68778751 is a wasteful number, since it uses less digits than its factorization.

68778751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17600.

The product of its digits is 658560, while the sum is 49.

The square root of 68778751 is about 8293.2955451979. The cubic root of 68778751 is about 409.7177335376.

The spelling of 68778751 in words is "sixty-eight million, seven hundred seventy-eight thousand, seven hundred fifty-one".