66885480 has 128 divisors (see below), whose sum is σ = 236131200. Its totient is φ = 16782336.

The previous prime is 66885457. The next prime is 66885487. The reversal of 66885480 is 8458866.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (66885487) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16539 + ... + 20181.

It is an arithmetic number, because the mean of its divisors is an integer number (1844775).

Almost surely, 2^66885480 is an apocalyptic number.

66885480 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 66885480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118065600).

66885480 is an abundant number, since it is smaller than the sum of its proper divisors (169245720).

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

66885480 is a wasteful number, since it uses less digits than its factorization.

66885480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3680 (or 3670 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 45.

The square root of 66885480 is about 8178.3543576932. The cubic root of 66885480 is about 405.9232708665.

The spelling of 66885480 in words is "sixty-six million, eight hundred eighty-five thousand, four hundred eighty".