66963890 has 40 divisors (see below), whose sum is σ = 140666220. Its totient is φ = 22950816.

The previous prime is 66963877. The next prime is 66963893. The reversal of 66963890 is 9836966.

It can be written as a sum of positive squares in 2 ways, for example, as 66961489 + 2401 = 8183^2 + 49^2 .

It is not an unprimeable number, because it can be changed into a prime (66963893) by changing a digit.

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 19 ways as a sum of consecutive naturals, for example, 22616 + ... + 25404.

Almost surely, 2^66963890 is an apocalyptic number.

66963890 is an abundant number, since it is smaller than the sum of its proper divisors (73702330).

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

66963890 is an equidigital number, since it uses as much as digits as its factorization.

66963890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2824 (or 2803 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 47.

The square root of 66963890 is about 8183.1467052718. The cubic root of 66963890 is about 406.0818305132.

The spelling of 66963890 in words is "sixty-six million, nine hundred sixty-three thousand, eight hundred ninety".