66504890 has 16 divisors (see below), whose sum is σ = 119804832. Its totient is φ = 26580624.

The previous prime is 66504881. The next prime is 66504899. The reversal of 66504890 is 9840566.

It is an interprime number because it is at equal distance from previous prime (66504881) and next prime (66504899).

It is not an unprimeable number, because it can be changed into a prime (66504899) 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, 18197 + ... + 21543.

It is an arithmetic number, because the mean of its divisors is an integer number (7487802).

Almost surely, 2^66504890 is an apocalyptic number.

66504890 is a deficient number, since it is larger than the sum of its proper divisors (53299942).

66504890 is a wasteful number, since it uses less digits than its factorization.

66504890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5341.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 66504890 is about 8155.0530347754. The cubic root of 66504890 is about 405.1518812559.

The spelling of 66504890 in words is "sixty-six million, five hundred four thousand, eight hundred ninety".