66634064 has 80 divisors (see below), whose sum is σ = 157073280. Its totient is φ = 26749440.

The previous prime is 66634037. The next prime is 66634081. The reversal of 66634064 is 46043666.

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, 368054 + ... + 368234.

It is an arithmetic number, because the mean of its divisors is an integer number (1963416).

Almost surely, 2^66634064 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 66634064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78536640).

66634064 is an abundant number, since it is smaller than the sum of its proper divisors (90439216).

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

66634064 is a wasteful number, since it uses less digits than its factorization.

66634064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388 (or 382 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 35.

The square root of 66634064 is about 8162.9690676861. The cubic root of 66634064 is about 405.4140235922.

The spelling of 66634064 in words is "sixty-six million, six hundred thirty-four thousand, sixty-four".