67640109 has 8 divisors (see below), whose sum is σ = 93096192. Its totient is φ = 43638720.

The previous prime is 67640101. The next prime is 67640117. The reversal of 67640109 is 90104676.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (67640101) and next prime (67640117).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 67640109 - 2³ = 67640101 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 67640109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67640101) 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, 363564 + ... + 363749.

It is an arithmetic number, because the mean of its divisors is an integer number (11637024).

Almost surely, 2^67640109 is an apocalyptic number.

It is an amenable number.

67640109 is a deficient number, since it is larger than the sum of its proper divisors (25456083).

67640109 is a wasteful number, since it uses less digits than its factorization.

67640109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 727347.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 67640109 is about 8224.3607046384. The cubic root of 67640109 is about 407.4441621209. Note that the first 3 decimals are identical.

The spelling of 67640109 in words is "sixty-seven million, six hundred forty thousand, one hundred nine".