66223488 has 128 divisors (see below), whose sum is σ = 186048000. Its totient is φ = 20846592.

The previous prime is 66223441. The next prime is 66223489. The reversal of 66223488 is 88432266.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×66223488² = 8771100725772288, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

Its product of digits (110592) is a multiple of the sum of its prime factors (192).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66223489) 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, 838233 + ... + 838311.

It is an arithmetic number, because the mean of its divisors is an integer number (1453500).

Almost surely, 2^66223488 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 66223488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93024000).

66223488 is an abundant number, since it is smaller than the sum of its proper divisors (119824512).

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

66223488 is a wasteful number, since it uses less digits than its factorization.

66223488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192 (or 180 counting only the distinct ones).

The product of its digits is 110592, while the sum is 39.

The square root of 66223488 is about 8137.7815158678. The cubic root of 66223488 is about 404.5796339471.

The spelling of 66223488 in words is "sixty-six million, two hundred twenty-three thousand, four hundred eighty-eight".