66147884 has 48 divisors (see below), whose sum is σ = 134701056. Its totient is φ = 28089600.

The previous prime is 66147881. The next prime is 66147899. The reversal of 66147884 is 48874166.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is not an unprimeable number, because it can be changed into a prime (66147881) 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, 142637 + ... + 143099.

It is an arithmetic number, because the mean of its divisors is an integer number (2806272).

Almost surely, 2^66147884 is an apocalyptic number.

It is an amenable number.

66147884 is an abundant number, since it is smaller than the sum of its proper divisors (68553172).

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

66147884 is a wasteful number, since it uses less digits than its factorization.

66147884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 686 (or 684 counting only the distinct ones).

The product of its digits is 258048, while the sum is 44.

The square root of 66147884 is about 8133.1349429356. The cubic root of 66147884 is about 404.4256126316.

The spelling of 66147884 in words is "sixty-six million, one hundred forty-seven thousand, eight hundred eighty-four".