32140640 has 48 divisors (see below), whose sum is σ = 86782752. Its totient is φ = 11019264.

The previous prime is 32140639. The next prime is 32140649. The reversal of 32140640 is 4604123.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (32140649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13229 + ... + 15468.

It is an arithmetic number, because the mean of its divisors is an integer number (1807974).

Almost surely, 2^32140640 is an apocalyptic number.

It is an amenable number.

32140640 is an abundant number, since it is smaller than the sum of its proper divisors (54642112).

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

32140640 is a wasteful number, since it uses less digits than its factorization.

32140640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28719 (or 28711 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 32140640 is about 5669.2715581457. The cubic root of 32140640 is about 317.9446391768.

Adding to 32140640 its reverse (4604123), we get a palindrome (36744763).

The spelling of 32140640 in words is "thirty-two million, one hundred forty thousand, six hundred forty".