66542432 has 24 divisors (see below), whose sum is σ = 142915752. Its totient is φ = 30246400.

The previous prime is 66542431. The next prime is 66542447. The reversal of 66542432 is 23424566.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66542431) 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, 94169 + ... + 94872.

It is an arithmetic number, because the mean of its divisors is an integer number (5954823).

Almost surely, 2^66542432 is an apocalyptic number.

It is an amenable number.

66542432 is an abundant number, since it is smaller than the sum of its proper divisors (76373320).

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

66542432 is a wasteful number, since it uses less digits than its factorization.

66542432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189062 (or 189054 counting only the distinct ones).

The product of its digits is 34560, while the sum is 32.

The square root of 66542432 is about 8157.3544731120. The cubic root of 66542432 is about 405.2281029731.

Adding to 66542432 its reverse (23424566), we get a palindrome (89966998).

The spelling of 66542432 in words is "sixty-six million, five hundred forty-two thousand, four hundred thirty-two".