68778813 has 8 divisors (see below), whose sum is σ = 93656448. Its totient is φ = 44876864.

The previous prime is 68778797. The next prime is 68778817. The reversal of 68778813 is 31887786.

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

It is a cyclic number.

It is not a de Polignac number, because 68778813 - 2⁴ = 68778797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68778817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 243756 + ... + 244037.

It is an arithmetic number, because the mean of its divisors is an integer number (11707056).

Almost surely, 2^68778813 is an apocalyptic number.

It is an amenable number.

68778813 is a deficient number, since it is larger than the sum of its proper divisors (24877635).

68778813 is a wasteful number, since it uses less digits than its factorization.

68778813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487843.

The product of its digits is 451584, while the sum is 48.

The square root of 68778813 is about 8293.2992831563. The cubic root of 68778813 is about 409.7178566498.

The spelling of 68778813 in words is "sixty-eight million, seven hundred seventy-eight thousand, eight hundred thirteen".