67840061 has 4 divisors (see below), whose sum is σ = 68098272. Its totient is φ = 67581852.

The previous prime is 67840043. The next prime is 67840093. The reversal of 67840061 is 16004876.

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 not a de Polignac number, because 67840061 - 2¹⁴ = 67823677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67840001) 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, 128711 + ... + 129236.

It is an arithmetic number, because the mean of its divisors is an integer number (17024568).

Almost surely, 2^67840061 is an apocalyptic number.

It is an amenable number.

67840061 is a deficient number, since it is larger than the sum of its proper divisors (258211).

67840061 is a wasteful number, since it uses less digits than its factorization.

67840061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258210.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 67840061 is about 8236.5078158161. The cubic root of 67840061 is about 407.8452512102.

The spelling of 67840061 in words is "sixty-seven million, eight hundred forty thousand, sixty-one".