67640611 has 4 divisors (see below), whose sum is σ = 69290424. Its totient is φ = 65990800.

The previous prime is 67640579. The next prime is 67640633. The reversal of 67640611 is 11604676.

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 67640611 - 2⁵ = 67640579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67640411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 824845 + ... + 824926.

It is an arithmetic number, because the mean of its divisors is an integer number (17322606).

Almost surely, 2^67640611 is an apocalyptic number.

67640611 is a deficient number, since it is larger than the sum of its proper divisors (1649813).

67640611 is a wasteful number, since it uses less digits than its factorization.

67640611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1649812.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 67640611 is about 8224.3912236712. The cubic root of 67640611 is about 407.4451700853.

The spelling of 67640611 in words is "sixty-seven million, six hundred forty thousand, six hundred eleven".