68455921 has 8 divisors (see below), whose sum is σ = 71377920. Its totient is φ = 65571408.

The previous prime is 68455909. The next prime is 68455931. The reversal of 68455921 is 12955486.

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 68455921 - 2¹⁵ = 68423153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68455931) 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, 5611 + ... + 12976.

It is an arithmetic number, because the mean of its divisors is an integer number (8922240).

Almost surely, 2^68455921 is an apocalyptic number.

It is an amenable number.

68455921 is a deficient number, since it is larger than the sum of its proper divisors (2921999).

68455921 is a wasteful number, since it uses less digits than its factorization.

68455921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18743.

The product of its digits is 86400, while the sum is 40.

The square root of 68455921 is about 8273.8093403220. The cubic root of 68455921 is about 409.0756909431.

The spelling of 68455921 in words is "sixty-eight million, four hundred fifty-five thousand, nine hundred twenty-one".