66380544 has 108 divisors (see below), whose sum is σ = 195782496. Its totient is φ = 21620736.

The previous prime is 66380491. The next prime is 66380593. The reversal of 66380544 is 44508366.

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

It is a junction number, because it is equal to n+sod(n) for n = 66380499 and 66380508.

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, 107982 + ... + 108594.

Almost surely, 2^66380544 is an apocalyptic number.

66380544 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66380544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97891248).

66380544 is an abundant number, since it is smaller than the sum of its proper divisors (129401952).

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

66380544 is a wasteful number, since it uses less digits than its factorization.

66380544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 682 (or 665 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 66380544 is about 8147.4256056745. The cubic root of 66380544 is about 404.8992158914.

The spelling of 66380544 in words is "sixty-six million, three hundred eighty thousand, five hundred forty-four".