66227520 has 112 divisors (see below), whose sum is σ = 212140800. Its totient is φ = 17504256.

The previous prime is 66227489. The next prime is 66227527. The reversal of 66227520 is 2572266.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66227527) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 142809 + ... + 143271.

Almost surely, 2^66227520 is an apocalyptic number.

66227520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66227520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106070400).

66227520 is an abundant number, since it is smaller than the sum of its proper divisors (145913280).

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

66227520 is a wasteful number, since it uses less digits than its factorization.

66227520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632 (or 622 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 30.

The square root of 66227520 is about 8138.0292454623. The cubic root of 66227520 is about 404.5878446894.

Adding to 66227520 its reverse (2572266), we get a palindrome (68799786).

It can be divided in two parts, 662 and 27520, that added together give a palindrome (28182).

The spelling of 66227520 in words is "sixty-six million, two hundred twenty-seven thousand, five hundred twenty".