68957813 has 4 divisors (see below), whose sum is σ = 68977728. Its totient is φ = 68937900.

The previous prime is 68957773. The next prime is 68957893. The reversal of 68957813 is 31875986.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 68957813 - 2⁸ = 68957557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68957893) 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 3 ways as a sum of consecutive naturals, for example, 3263 + ... + 12188.

It is an arithmetic number, because the mean of its divisors is an integer number (17244432).

Almost surely, 2^68957813 is an apocalyptic number.

It is an amenable number.

68957813 is a deficient number, since it is larger than the sum of its proper divisors (19915).

68957813 is a wasteful number, since it uses less digits than its factorization.

68957813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19914.

The product of its digits is 362880, while the sum is 47.

The square root of 68957813 is about 8304.0841156626. The cubic root of 68957813 is about 410.0729852223.

The spelling of 68957813 in words is "sixty-eight million, nine hundred fifty-seven thousand, eight hundred thirteen".