66755240 has 32 divisors (see below), whose sum is σ = 152016480. Its totient is φ = 26379072.

The previous prime is 66755239. The next prime is 66755261. The reversal of 66755240 is 4255766.

It is a self number, because there is not a number n which added to its sum of digits gives 66755240.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6734 + ... + 13373.

It is an arithmetic number, because the mean of its divisors is an integer number (4750515).

Almost surely, 2^66755240 is an apocalyptic number.

It is an amenable number.

66755240 is an abundant number, since it is smaller than the sum of its proper divisors (85261240).

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

66755240 is a wasteful number, since it uses less digits than its factorization.

66755240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20201 (or 20197 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 35.

The square root of 66755240 is about 8170.3879956829. The cubic root of 66755240 is about 405.6596272046.

The spelling of 66755240 in words is "sixty-six million, seven hundred fifty-five thousand, two hundred forty".