66442864 has 10 divisors (see below), whose sum is σ = 128733080. Its totient is φ = 33221424.

The previous prime is 66442853. The next prime is 66442891. The reversal of 66442864 is 46824466.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2076324 + ... + 2076355.

It is an arithmetic number, because the mean of its divisors is an integer number (12873308).

Almost surely, 2^66442864 is an apocalyptic number.

It is an amenable number.

66442864 is a deficient number, since it is larger than the sum of its proper divisors (62290216).

66442864 is a wasteful number, since it uses less digits than its factorization.

66442864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4152687 (or 4152681 counting only the distinct ones).

The product of its digits is 221184, while the sum is 40.

The square root of 66442864 is about 8151.2492294126. The cubic root of 66442864 is about 405.0258866754.

The spelling of 66442864 in words is "sixty-six million, four hundred forty-two thousand, eight hundred sixty-four".