66672320 has 224 divisors, whose sum is σ = 196632576. Its totient is φ = 21196800.

The previous prime is 66672269. The next prime is 66672401. The reversal of 66672320 is 2327666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1418537 + ... + 1418583.

It is an arithmetic number, because the mean of its divisors is an integer number (877824).

Almost surely, 2^66672320 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 66672320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98316288).

66672320 is an abundant number, since it is smaller than the sum of its proper divisors (129960256).

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

66672320 is a wasteful number, since it uses less digits than its factorization.

66672320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119 (or 109 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 32.

The square root of 66672320 is about 8165.3119964886. The cubic root of 66672320 is about 405.4915942860.

Adding to 66672320 its reverse (2327666), we get a palindrome (68999986).

The spelling of 66672320 in words is "sixty-six million, six hundred seventy-two thousand, three hundred twenty".