66864448 has 28 divisors (see below), whose sum is σ = 151640032. Its totient is φ = 28656000.

The previous prime is 66864443. The next prime is 66864487. The reversal of 66864448 is 84446866.

It is a tau number, because it is divible by the number of its divisors (28).

It is a junction number, because it is equal to n+sod(n) for n = 66864398 and 66864407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66864443) 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, 74178 + ... + 75073.

Almost surely, 2^66864448 is an apocalyptic number.

It is an amenable number.

66864448 is an abundant number, since it is smaller than the sum of its proper divisors (84775584).

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

66864448 is a wasteful number, since it uses less digits than its factorization.

66864448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149270 (or 149260 counting only the distinct ones).

The product of its digits is 884736, while the sum is 46.

The square root of 66864448 is about 8177.0684233410. The cubic root of 66864448 is about 405.8807191635.

The spelling of 66864448 in words is "sixty-six million, eight hundred sixty-four thousand, four hundred forty-eight".