67681613 has 8 divisors (see below), whose sum is σ = 69369696. Its totient is φ = 65998800.

The previous prime is 67681589. The next prime is 67681633. The reversal of 67681613 is 31618676.

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 67681613 - 2⁸ = 67681357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67681633) 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, 40943 + ... + 42563.

It is an arithmetic number, because the mean of its divisors is an integer number (8671212).

Almost surely, 2^67681613 is an apocalyptic number.

It is an amenable number.

67681613 is a deficient number, since it is larger than the sum of its proper divisors (1688083).

67681613 is a wasteful number, since it uses less digits than its factorization.

67681613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2635.

The product of its digits is 36288, while the sum is 38.

The square root of 67681613 is about 8226.8835533269. The cubic root of 67681613 is about 407.5274810528.

The spelling of 67681613 in words is "sixty-seven million, six hundred eighty-one thousand, six hundred thirteen".