66210090 has 32 divisors (see below), whose sum is σ = 160318656. Its totient is φ = 17498880.

The previous prime is 66210061. The next prime is 66210101. The reversal of 66210090 is 9001266.

66210090 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 66210090.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6376 + ... + 13155.

It is an arithmetic number, because the mean of its divisors is an integer number (5009958).

Almost surely, 2^66210090 is an apocalyptic number.

66210090 is an abundant number, since it is smaller than the sum of its proper divisors (94108566).

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

66210090 is a wasteful number, since it uses less digits than its factorization.

66210090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19654.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 66210090 is about 8136.9582768993. The cubic root of 66210090 is about 404.5523479408.

The spelling of 66210090 in words is "sixty-six million, two hundred ten thousand, ninety".