67648481 has 4 divisors (see below), whose sum is σ = 67778352. Its totient is φ = 67518612.

The previous prime is 67648447. The next prime is 67648489. The reversal of 67648481 is 18484676.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67648481 is a prime.

It is a super-2 number, since 2×67648481² = 9152633963214722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67648489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64151 + ... + 65196.

It is an arithmetic number, because the mean of its divisors is an integer number (16944588).

Almost surely, 2^67648481 is an apocalyptic number.

It is an amenable number.

67648481 is a deficient number, since it is larger than the sum of its proper divisors (129871).

67648481 is a wasteful number, since it uses less digits than its factorization.

67648481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129870.

The product of its digits is 258048, while the sum is 44.

The square root of 67648481 is about 8224.8696646208. The cubic root of 67648481 is about 407.4609715843.

The spelling of 67648481 in words is "sixty-seven million, six hundred forty-eight thousand, four hundred eighty-one".