66428560 has 160 divisors (see below), whose sum is σ = 184809600. Its totient is φ = 21934080.

The previous prime is 66428543. The next prime is 66428611. The reversal of 66428560 is 6582466.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 484812 + ... + 484948.

It is an arithmetic number, because the mean of its divisors is an integer number (1155060).

Almost surely, 2^66428560 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 66428560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92404800).

66428560 is an abundant number, since it is smaller than the sum of its proper divisors (118381040).

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

66428560 is a wasteful number, since it uses less digits than its factorization.

66428560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209 (or 203 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 37.

The square root of 66428560 is about 8150.3717706618. The cubic root of 66428560 is about 404.9968195655.

The spelling of 66428560 in words is "sixty-six million, four hundred twenty-eight thousand, five hundred sixty".