66489312 has 96 divisors (see below), whose sum is σ = 186810624. Its totient is φ = 20633600.

The previous prime is 66489307. The next prime is 66489317. The reversal of 66489312 is 21398466.

It is an interprime number because it is at equal distance from previous prime (66489307) and next prime (66489317).

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×66489312² = 8841657220466688, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66489317) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 213637 + ... + 213947.

It is an arithmetic number, because the mean of its divisors is an integer number (1945944).

Almost surely, 2^66489312 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 66489312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93405312).

66489312 is an abundant number, since it is smaller than the sum of its proper divisors (120321312).

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

66489312 is a wasteful number, since it uses less digits than its factorization.

66489312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472 (or 464 counting only the distinct ones).

The product of its digits is 62208, while the sum is 39.

The square root of 66489312 is about 8154.0978654907. The cubic root of 66489312 is about 405.1202447408.

The spelling of 66489312 in words is "sixty-six million, four hundred eighty-nine thousand, three hundred twelve".