68794721 has 4 divisors (see below), whose sum is σ = 68843712. Its totient is φ = 68745732.

The previous prime is 68794637. The next prime is 68794723. The reversal of 68794721 is 12749786.

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 68794721 - 2¹⁸ = 68532577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68794723) 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, 22325 + ... + 25218.

It is an arithmetic number, because the mean of its divisors is an integer number (17210928).

Almost surely, 2^68794721 is an apocalyptic number.

It is an amenable number.

68794721 is a deficient number, since it is larger than the sum of its proper divisors (48991).

68794721 is a wasteful number, since it uses less digits than its factorization.

68794721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48990.

The product of its digits is 169344, while the sum is 44.

The square root of 68794721 is about 8294.2583152443. The cubic root of 68794721 is about 409.7494423903.

The spelling of 68794721 in words is "sixty-eight million, seven hundred ninety-four thousand, seven hundred twenty-one".