66685432 has 32 divisors (see below), whose sum is σ = 139582080. Its totient is φ = 29604960.

The previous prime is 66685403. The next prime is 66685439. The reversal of 66685432 is 23458666.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66685439) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5028 + ... + 12595.

It is an arithmetic number, because the mean of its divisors is an integer number (4361940).

Almost surely, 2^66685432 is an apocalyptic number.

It is an amenable number.

66685432 is an abundant number, since it is smaller than the sum of its proper divisors (72896648).

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

66685432 is a wasteful number, since it uses less digits than its factorization.

66685432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17683 (or 17679 counting only the distinct ones).

The product of its digits is 207360, while the sum is 40.

The square root of 66685432 is about 8166.1148657118. The cubic root of 66685432 is about 405.5181743184.

It can be divided in two parts, 6668 and 5432, that added together give a square (12100 = 110²).

The spelling of 66685432 in words is "sixty-six million, six hundred eighty-five thousand, four hundred thirty-two".