66649060 has 24 divisors (see below), whose sum is σ = 140116536. Its totient is φ = 26630400.

The previous prime is 66649043. The next prime is 66649069. The reversal of 66649060 is 6094666.

It can be written as a sum of positive squares in 4 ways, for example, as 3541924 + 63107136 = 1882^2 + 7944^2 .

It is not an unprimeable number, because it can be changed into a prime (66649069) 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, 34110 + ... + 36010.

It is an arithmetic number, because the mean of its divisors is an integer number (5838189).

Almost surely, 2^66649060 is an apocalyptic number.

It is an amenable number.

66649060 is an abundant number, since it is smaller than the sum of its proper divisors (73467476).

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

66649060 is a wasteful number, since it uses less digits than its factorization.

66649060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3663 (or 3661 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 37.

The square root of 66649060 is about 8163.8875543457. The cubic root of 66649060 is about 405.4444341276. Note that the first 4 decimals are identical.

The spelling of 66649060 in words is "sixty-six million, six hundred forty-nine thousand, sixty".