68569721 has 8 divisors (see below), whose sum is σ = 79203744. Its totient is φ = 58669120.

The previous prime is 68569691. The next prime is 68569747. The reversal of 68569721 is 12796586.

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 68569721 - 2¹⁴ = 68553337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68569751) 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, 183155 + ... + 183528.

It is an arithmetic number, because the mean of its divisors is an integer number (9900468).

Almost surely, 2^68569721 is an apocalyptic number.

It is an amenable number.

68569721 is a deficient number, since it is larger than the sum of its proper divisors (10634023).

68569721 is a wasteful number, since it uses less digits than its factorization.

68569721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366711.

The product of its digits is 181440, while the sum is 44.

The square root of 68569721 is about 8280.6836070460. The cubic root of 68569721 is about 409.3022456882.

The spelling of 68569721 in words is "sixty-eight million, five hundred sixty-nine thousand, seven hundred twenty-one".