68457221 has 8 divisors (see below), whose sum is σ = 78418560. Its totient is φ = 58541328.

The previous prime is 68457217. The next prime is 68457241. The reversal of 68457221 is 12275486.

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 68457221 - 2² = 68457217 is a prime.

It is a super-2 number, since 2×68457221² = 9372782214085682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68457211) 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, 8066 + ... + 14211.

It is an arithmetic number, because the mean of its divisors is an integer number (9802320).

Almost surely, 2^68457221 is an apocalyptic number.

It is an amenable number.

68457221 is a deficient number, since it is larger than the sum of its proper divisors (9961339).

68457221 is a wasteful number, since it uses less digits than its factorization.

68457221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22723.

The product of its digits is 26880, while the sum is 35.

The square root of 68457221 is about 8273.8879011019. The cubic root of 68457221 is about 409.0782804197.

The spelling of 68457221 in words is "sixty-eight million, four hundred fifty-seven thousand, two hundred twenty-one".