66470544 has 200 divisors, whose sum is σ = 233342208. Its totient is φ = 17832960.

The previous prime is 66470543. The next prime is 66470557. The reversal of 66470544 is 44507466.

66470544 is a `hidden beast` number, since 6 + 647 + 0 + 5 + 4 + 4 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 66470499 and 66470508.

It is not an unprimeable number, because it can be changed into a prime (66470543) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 154009 + ... + 154439.

Almost surely, 2^66470544 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 66470544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116671104).

66470544 is an abundant number, since it is smaller than the sum of its proper divisors (166871664).

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

66470544 is a wasteful number, since it uses less digits than its factorization.

66470544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475 (or 460 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 36.

The square root of 66470544 is about 8152.9469518696. The cubic root of 66470544 is about 405.0821232641.

Subtracting from 66470544 its product of nonzero digits (80640), we obtain a square (66389904 = 8148²).

The spelling of 66470544 in words is "sixty-six million, four hundred seventy thousand, five hundred forty-four".