66764480 has 112 divisors (see below), whose sum is σ = 170688000. Its totient is φ = 24800256.

The previous prime is 66764473. The next prime is 66764549. The reversal of 66764480 is 8446766.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 480251 + ... + 480389.

It is an arithmetic number, because the mean of its divisors is an integer number (1524000).

Almost surely, 2^66764480 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 66764480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85344000).

66764480 is an abundant number, since it is smaller than the sum of its proper divisors (103923520).

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

66764480 is a wasteful number, since it uses less digits than its factorization.

66764480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254 (or 244 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 41.

The square root of 66764480 is about 8170.9534327397. The cubic root of 66764480 is about 405.6783429490.

The spelling of 66764480 in words is "sixty-six million, seven hundred sixty-four thousand, four hundred eighty".