67881491 has 4 divisors (see below), whose sum is σ = 67920984. Its totient is φ = 67842000.

The previous prime is 67881481. The next prime is 67881523. The reversal of 67881491 is 19418876.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 67881491 - 2⁶ = 67881427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67881481) 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, 17045 + ... + 20646.

It is an arithmetic number, because the mean of its divisors is an integer number (16980246).

Almost surely, 2^67881491 is an apocalyptic number.

67881491 is a deficient number, since it is larger than the sum of its proper divisors (39493).

67881491 is a wasteful number, since it uses less digits than its factorization.

67881491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39492.

The product of its digits is 96768, while the sum is 44.

The square root of 67881491 is about 8239.0224541507. The cubic root of 67881491 is about 407.9282581631.

The spelling of 67881491 in words is "sixty-seven million, eight hundred eighty-one thousand, four hundred ninety-one".