68978913 has 4 divisors (see below), whose sum is σ = 91971888. Its totient is φ = 45985940.

The previous prime is 68978887. The next prime is 68978927. The reversal of 68978913 is 31987986.

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 68978913 - 2⁵ = 68978881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68978953) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11496483 + ... + 11496488.

It is an arithmetic number, because the mean of its divisors is an integer number (22992972).

Almost surely, 2^68978913 is an apocalyptic number.

It is an amenable number.

68978913 is a deficient number, since it is larger than the sum of its proper divisors (22992975).

68978913 is a wasteful number, since it uses less digits than its factorization.

68978913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22992974.

The product of its digits is 653184, while the sum is 51.

The square root of 68978913 is about 8305.3544776849. The cubic root of 68978913 is about 410.1148062394.

The spelling of 68978913 in words is "sixty-eight million, nine hundred seventy-eight thousand, nine hundred thirteen".