66275990 has 48 divisors (see below), whose sum is σ = 137434320. Its totient is φ = 22818240.

The previous prime is 66275987. The next prime is 66275999. The reversal of 66275990 is 9957266.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66275999) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38876 + ... + 40544.

It is an arithmetic number, because the mean of its divisors is an integer number (2863215).

Almost surely, 2^66275990 is an apocalyptic number.

66275990 is an abundant number, since it is smaller than the sum of its proper divisors (71158330).

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

66275990 is a wasteful number, since it uses less digits than its factorization.

66275990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1725 (or 1706 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 44.

The square root of 66275990 is about 8141.0066945065. The cubic root of 66275990 is about 404.6865226543.

The spelling of 66275990 in words is "sixty-six million, two hundred seventy-five thousand, nine hundred ninety".