68456421 has 20 divisors (see below), whose sum is σ = 111560064. Its totient is φ = 41488200.

The previous prime is 68456419. The next prime is 68456447. The reversal of 68456421 is 12465486.

68456421 is a `hidden beast` number, since 6 + 8 + 4 + 5 + 642 + 1 = 666.

It is not a de Polignac number, because 68456421 - 2¹ = 68456419 is a prime.

It is a super-2 number, since 2×68456421² = 9372563152258482, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68456021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 37525 + ... + 39306.

Almost surely, 2^68456421 is an apocalyptic number.

It is an amenable number.

68456421 is a deficient number, since it is larger than the sum of its proper divisors (43103643).

68456421 is a wasteful number, since it uses less digits than its factorization.

68456421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76854 (or 76845 counting only the distinct ones).

The product of its digits is 46080, while the sum is 36.

The square root of 68456421 is about 8273.8395560949. The cubic root of 68456421 is about 409.0766868995.

The spelling of 68456421 in words is "sixty-eight million, four hundred fifty-six thousand, four hundred twenty-one".