66214320 has 80 divisors (see below), whose sum is σ = 217352160. Its totient is φ = 16617472.

The previous prime is 66214307. The next prime is 66214321. The reversal of 66214320 is 2341266.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (66214321) 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, 4035 + ... + 12194.

It is an arithmetic number, because the mean of its divisors is an integer number (2716902).

Almost surely, 2^66214320 is an apocalyptic number.

66214320 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66214320 is an abundant number, since it is smaller than the sum of its proper divisors (151137840).

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

66214320 is a wasteful number, since it uses less digits than its factorization.

66214320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16262 (or 16256 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 66214320 is about 8137.2181978856. The cubic root of 66214320 is about 404.5609630426.

Adding to 66214320 its reverse (2341266), we get a palindrome (68555586).

The spelling of 66214320 in words is "sixty-six million, two hundred fourteen thousand, three hundred twenty".