66774704 has 40 divisors (see below), whose sum is σ = 139678560. Its totient is φ = 30829568.

The previous prime is 66774661. The next prime is 66774707. The reversal of 66774704 is 40747766.

It is a super-2 number, since 2×66774704² = 8917722188575232, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66774707) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7544 + ... + 13800.

It is an arithmetic number, because the mean of its divisors is an integer number (3491964).

Almost surely, 2^66774704 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 66774704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69839280).

66774704 is an abundant number, since it is smaller than the sum of its proper divisors (72903856).

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

66774704 is a wasteful number, since it uses less digits than its factorization.

66774704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6317 (or 6311 counting only the distinct ones).

The product of its (nonzero) digits is 197568, while the sum is 41.

The square root of 66774704 is about 8171.5790395737. The cubic root of 66774704 is about 405.6990497863.

The spelling of 66774704 in words is "sixty-six million, seven hundred seventy-four thousand, seven hundred four".