66489876 has 48 divisors (see below), whose sum is σ = 174585600. Its totient is φ = 21879936.

The previous prime is 66489869. The next prime is 66489877. The reversal of 66489876 is 67898466.

It is a super-2 number, since 2×66489876² = 8841807220990752, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66489877) 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, 4636 + ... + 12428.

It is an arithmetic number, because the mean of its divisors is an integer number (3637200).

Almost surely, 2^66489876 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 66489876, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87292800).

66489876 is an abundant number, since it is smaller than the sum of its proper divisors (108095724).

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

66489876 is a wasteful number, since it uses less digits than its factorization.

66489876 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7885 (or 7877 counting only the distinct ones).

The product of its digits is 3483648, while the sum is 54.

The square root of 66489876 is about 8154.1324492554. The cubic root of 66489876 is about 405.1213902240.

The spelling of 66489876 in words is "sixty-six million, four hundred eighty-nine thousand, eight hundred seventy-six".