66624448 has 56 divisors (see below), whose sum is σ = 145810224. Its totient is φ = 29952000.

The previous prime is 66624443. The next prime is 66624451. The reversal of 66624448 is 84442666.

It is a self number, because there is not a number n which added to its sum of digits gives 66624448.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66624443) 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, 70636 + ... + 71572.

It is an arithmetic number, because the mean of its divisors is an integer number (2603754).

Almost surely, 2^66624448 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 66624448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72905112).

66624448 is an abundant number, since it is smaller than the sum of its proper divisors (79185776).

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

66624448 is a wasteful number, since it uses less digits than its factorization.

66624448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1061 (or 1051 counting only the distinct ones).

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

The square root of 66624448 is about 8162.3800450604. The cubic root of 66624448 is about 405.3945208106.

The spelling of 66624448 in words is "sixty-six million, six hundred twenty-four thousand, four hundred forty-eight".