66471632 has 20 divisors (see below), whose sum is σ = 136365156. Its totient is φ = 31280640.

The previous prime is 66471631. The next prime is 66471637. The reversal of 66471632 is 23617466.

It can be written as a sum of positive squares in 2 ways, for example, as 46185616 + 20286016 = 6796^2 + 4504^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66471592 and 66471601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66471631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121919 + ... + 122462.

Almost surely, 2^66471632 is an apocalyptic number.

It is an amenable number.

66471632 is an abundant number, since it is smaller than the sum of its proper divisors (69893524).

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

66471632 is a wasteful number, since it uses less digits than its factorization.

66471632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244406 (or 244400 counting only the distinct ones).

The product of its digits is 36288, while the sum is 35.

The square root of 66471632 is about 8153.0136759360. The cubic root of 66471632 is about 405.0843334007.

The spelling of 66471632 in words is "sixty-six million, four hundred seventy-one thousand, six hundred thirty-two".