66328560 has 120 divisors (see below), whose sum is σ = 235900080. Its totient is φ = 16644096.

The previous prime is 66328541. The next prime is 66328579. The reversal of 66328560 is 6582366.

66328560 is a `hidden beast` number, since 66 + 32 + 8 + 560 = 666.

It is an interprime number because it is at equal distance from previous prime (66328541) and next prime (66328579).

It is a tau number, because it is divible by the number of its divisors (120).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9531 + ... + 14949.

It is an arithmetic number, because the mean of its divisors is an integer number (1965834).

Almost surely, 2^66328560 is an apocalyptic number.

66328560 is a gapful number since it is divisible by the number (60) 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 66328560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117950040).

66328560 is an abundant number, since it is smaller than the sum of its proper divisors (169571520).

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

66328560 is a wasteful number, since it uses less digits than its factorization.

66328560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5455 (or 5446 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 66328560 is about 8144.2347706829. The cubic root of 66328560 is about 404.7934932583.

The spelling of 66328560 in words is "sixty-six million, three hundred twenty-eight thousand, five hundred sixty".