67640920 has 16 divisors (see below), whose sum is σ = 152192160. Its totient is φ = 27056352.

The previous prime is 67640917. The next prime is 67640927. The reversal of 67640920 is 2904676.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67640927) 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, 845472 + ... + 845551.

It is an arithmetic number, because the mean of its divisors is an integer number (9512010).

Almost surely, 2^67640920 is an apocalyptic number.

It is an amenable number.

67640920 is an abundant number, since it is smaller than the sum of its proper divisors (84551240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

67640920 is a wasteful number, since it uses less digits than its factorization.

67640920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1691034 (or 1691030 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 67640920 is about 8224.4100092347. The cubic root of 67640920 is about 407.4457905231.

The spelling of 67640920 in words is "sixty-seven million, six hundred forty thousand, nine hundred twenty".