66147888 has 20 divisors (see below), whose sum is σ = 170882168. Its totient is φ = 22049280.

The previous prime is 66147881. The next prime is 66147899. The reversal of 66147888 is 88874166.

66147888 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 1378081 = 66147888 / (6 + 6 + 1 + 4 + 7 + 8 + 8 + 8).

It is not an unprimeable number, because it can be changed into a prime (66147881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 688993 + ... + 689088.

Almost surely, 2^66147888 is an apocalyptic number.

It is an amenable number.

66147888 is an abundant number, since it is smaller than the sum of its proper divisors (104734280).

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

66147888 is a wasteful number, since it uses less digits than its factorization.

66147888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1378092 (or 1378086 counting only the distinct ones).

The product of its digits is 516096, while the sum is 48.

The square root of 66147888 is about 8133.1351888432. The cubic root of 66147888 is about 404.4256207835.

The spelling of 66147888 in words is "sixty-six million, one hundred forty-seven thousand, eight hundred eighty-eight".