66990312 has 48 divisors (see below), whose sum is σ = 181839840. Its totient is φ = 22279968.

The previous prime is 66990307. The next prime is 66990331. The reversal of 66990312 is 21309966.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45573 + ... + 47019.

It is an arithmetic number, because the mean of its divisors is an integer number (3788330).

Almost surely, 2^66990312 is an apocalyptic number.

It is an amenable number.

66990312 is an abundant number, since it is smaller than the sum of its proper divisors (114849528).

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

66990312 is a wasteful number, since it uses less digits than its factorization.

66990312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2102 (or 2095 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 66990312 is about 8184.7609616897. The cubic root of 66990312 is about 406.1352328432.

The spelling of 66990312 in words is "sixty-six million, nine hundred ninety thousand, three hundred twelve".