66648824 has 32 divisors (see below), whose sum is σ = 138067200. Its totient is φ = 29908320.

The previous prime is 66648817. The next prime is 66648851. The reversal of 66648824 is 42884666.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2159 + ... + 11745.

It is an arithmetic number, because the mean of its divisors is an integer number (4314600).

Almost surely, 2^66648824 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 66648824, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69033600).

66648824 is an abundant number, since it is smaller than the sum of its proper divisors (71418376).

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

66648824 is a wasteful number, since it uses less digits than its factorization.

66648824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9683 (or 9679 counting only the distinct ones).

The product of its digits is 442368, while the sum is 44.

The square root of 66648824 is about 8163.8731004346. The cubic root of 66648824 is about 405.4439555763.

The spelling of 66648824 in words is "sixty-six million, six hundred forty-eight thousand, eight hundred twenty-four".