66817224 has 144 divisors (see below), whose sum is σ = 200756400. Its totient is φ = 20785248.

The previous prime is 66817213. The next prime is 66817237. The reversal of 66817224 is 42271866.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 997239 + ... + 997305.

Almost surely, 2^66817224 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 66817224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100378200).

66817224 is an abundant number, since it is smaller than the sum of its proper divisors (133939176).

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

66817224 is an equidigital number, since it uses as much as digits as its factorization.

66817224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116 (or 91 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 66817224 is about 8174.1803258798. The cubic root of 66817224 is about 405.7851435832.

The spelling of 66817224 in words is "sixty-six million, eight hundred seventeen thousand, two hundred twenty-four".