66624224 has 24 divisors (see below), whose sum is σ = 138883248. Its totient is φ = 31352320.

The previous prime is 66624193. The next prime is 66624227. The reversal of 66624224 is 42242666.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66624227) 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, 60692 + ... + 61779.

It is an arithmetic number, because the mean of its divisors is an integer number (5786802).

Almost surely, 2^66624224 is an apocalyptic number.

It is an amenable number.

66624224 is an abundant number, since it is smaller than the sum of its proper divisors (72259024).

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

66624224 is a wasteful number, since it uses less digits than its factorization.

66624224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122498 (or 122490 counting only the distinct ones).

The product of its digits is 27648, while the sum is 32.

The square root of 66624224 is about 8162.3663235608. The cubic root of 66624224 is about 405.3940664805.

The spelling of 66624224 in words is "sixty-six million, six hundred twenty-four thousand, two hundred twenty-four".