66990080 has 52 divisors (see below), whose sum is σ = 160805712. Its totient is φ = 26787840.

The previous prime is 66990071. The next prime is 66990089. The reversal of 66990080 is 8009966.

It is an interprime number because it is at equal distance from previous prime (66990071) and next prime (66990089).

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (66990089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18845 + ... + 22115.

Almost surely, 2^66990080 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66990080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80402856).

66990080 is an abundant number, since it is smaller than the sum of its proper divisors (93815632).

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

66990080 is an equidigital number, since it uses as much as digits as its factorization.

66990080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3300 (or 3278 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 66990080 is about 8184.7467889972. The cubic root of 66990080 is about 406.1347640019.

The spelling of 66990080 in words is "sixty-six million, nine hundred ninety thousand, eighty".