66612090 has 16 divisors (see below), whose sum is σ = 159869088. Its totient is φ = 17763216.

The previous prime is 66612083. The next prime is 66612109. The reversal of 66612090 is 9021666.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 2220403 = 66612090 / (6 + 6 + 6 + 1 + 2 + 0 + 9 + 0).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1110172 + ... + 1110231.

It is an arithmetic number, because the mean of its divisors is an integer number (9991818).

Almost surely, 2^66612090 is an apocalyptic number.

66612090 is an abundant number, since it is smaller than the sum of its proper divisors (93256998).

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

66612090 is a wasteful number, since it uses less digits than its factorization.

66612090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2220413.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 66612090 is about 8161.6230003597. The cubic root of 66612090 is about 405.3694540600.

The spelling of 66612090 in words is "sixty-six million, six hundred twelve thousand, ninety".