66641472 has 84 divisors (see below), whose sum is σ = 192731136. Its totient is φ = 22014720.

The previous prime is 66641467. The next prime is 66641489. The reversal of 66641472 is 27414666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 72697 + ... + 73607.

Almost surely, 2^66641472 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 66641472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96365568).

66641472 is an abundant number, since it is smaller than the sum of its proper divisors (126089664).

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

66641472 is a wasteful number, since it uses less digits than its factorization.

66641472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1056 (or 1043 counting only the distinct ones).

The product of its digits is 48384, while the sum is 36.

The square root of 66641472 is about 8163.4228115417. The cubic root of 66641472 is about 405.4290469182.

The spelling of 66641472 in words is "sixty-six million, six hundred forty-one thousand, four hundred seventy-two".