66470784 has 128 divisors (see below), whose sum is σ = 188006400. Its totient is φ = 20772864.

The previous prime is 66470783. The next prime is 66470791. The reversal of 66470784 is 48707466.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66470783) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 523329 + ... + 523455.

It is an arithmetic number, because the mean of its divisors is an integer number (1468800).

Almost surely, 2^66470784 is an apocalyptic number.

66470784 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 66470784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94003200).

66470784 is an abundant number, since it is smaller than the sum of its proper divisors (121535616).

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

66470784 is a wasteful number, since it uses less digits than its factorization.

66470784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220 (or 208 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 42.

The square root of 66470784 is about 8152.9616704606. The cubic root of 66470784 is about 405.0826107964.

The spelling of 66470784 in words is "sixty-six million, four hundred seventy thousand, seven hundred eighty-four".