67256421 has 8 divisors (see below), whose sum is σ = 89780544. Its totient is φ = 44784960.

The previous prime is 67256407. The next prime is 67256443. The reversal of 67256421 is 12465276.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 67256421 - 2¹³ = 67248229 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67256821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10081 + ... + 15366.

It is an arithmetic number, because the mean of its divisors is an integer number (11222568).

Almost surely, 2^67256421 is an apocalyptic number.

It is an amenable number.

67256421 is a deficient number, since it is larger than the sum of its proper divisors (22524123).

67256421 is a wasteful number, since it uses less digits than its factorization.

67256421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26331.

The product of its digits is 20160, while the sum is 33.

The square root of 67256421 is about 8201.0012193634. The cubic root of 67256421 is about 406.6722928392.

The spelling of 67256421 in words is "sixty-seven million, two hundred fifty-six thousand, four hundred twenty-one".