66572240 has 80 divisors (see below), whose sum is σ = 180309888. Its totient is φ = 22384128.

The previous prime is 66572203. The next prime is 66572249. The reversal of 66572240 is 4227566.

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

It is a junction number, because it is equal to n+sod(n) for n = 66572197 and 66572206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66572249) 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, 28559 + ... + 30801.

Almost surely, 2^66572240 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 66572240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90154944).

66572240 is an abundant number, since it is smaller than the sum of its proper divisors (113737648).

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

66572240 is a wasteful number, since it uses less digits than its factorization.

66572240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2316 (or 2310 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 66572240 is about 8159.1813314817. The cubic root of 66572240 is about 405.2886018947.

The spelling of 66572240 in words is "sixty-six million, five hundred seventy-two thousand, two hundred forty".