66744064 has 36 divisors (see below), whose sum is σ = 136498320. Its totient is φ = 32552960.

The previous prime is 66744061. The next prime is 66744113. The reversal of 66744064 is 46044766.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66744061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7317 + ... + 13675.

It is an arithmetic number, because the mean of its divisors is an integer number (3791620).

Almost surely, 2^66744064 is an apocalyptic number.

66744064 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 66744064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68249160).

66744064 is an abundant number, since it is smaller than the sum of its proper divisors (69754256).

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

66744064 is an equidigital number, since it uses as much as digits as its factorization.

66744064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6416 (or 6402 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 37.

The square root of 66744064 is about 8169.7040338069. The cubic root of 66744064 is about 405.6369877583.

The spelling of 66744064 in words is "sixty-six million, seven hundred forty-four thousand, sixty-four".