66770064 has 120 divisors (see below), whose sum is σ = 197308800. Its totient is φ = 21047040.

The previous prime is 66770057. The next prime is 66770069. The reversal of 66770064 is 46007766.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (66770069) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 246249 + ... + 246519.

It is an arithmetic number, because the mean of its divisors is an integer number (1644240).

Almost surely, 2^66770064 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 66770064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98654400).

66770064 is an abundant number, since it is smaller than the sum of its proper divisors (130538736).

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

66770064 is a wasteful number, since it uses less digits than its factorization.

66770064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373 (or 364 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 36.

The square root of 66770064 is about 8171.2951237855. The cubic root of 66770064 is about 405.6896525791.

The spelling of 66770064 in words is "sixty-six million, seven hundred seventy thousand, sixty-four".