66226990 has 16 divisors (see below), whose sum is σ = 119322720. Its totient is φ = 26465440.

The previous prime is 66226949. The next prime is 66226999. The reversal of 66226990 is 9962266.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66226999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10680 + ... + 15700.

It is an arithmetic number, because the mean of its divisors is an integer number (7457670).

Almost surely, 2^66226990 is an apocalyptic number.

66226990 is a deficient number, since it is larger than the sum of its proper divisors (53095730).

66226990 is a wasteful number, since it uses less digits than its factorization.

66226990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6347.

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 66226990 is about 8137.9966822308. The cubic root of 66226990 is about 404.5867654194.

The spelling of 66226990 in words is "sixty-six million, two hundred twenty-six thousand, nine hundred ninety".