32640144 has 20 divisors (see below), whose sum is σ = 84320496. Its totient is φ = 10880032.

The previous prime is 32640133. The next prime is 32640161. The reversal of 32640144 is 44104623.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 339954 + ... + 340049.

Almost surely, 2^32640144 is an apocalyptic number.

It is an amenable number.

32640144 is an abundant number, since it is smaller than the sum of its proper divisors (51680352).

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

32640144 is a wasteful number, since it uses less digits than its factorization.

32640144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 680014 (or 680008 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 32640144 is about 5713.1553453411. The cubic root of 32640144 is about 319.5832595922.

Adding to 32640144 its reverse (44104623), we get a palindrome (76744767).

It can be divided in two parts, 326 and 40144, that added together give a triangular number (40470 = T₂₈₄).

The spelling of 32640144 in words is "thirty-two million, six hundred forty thousand, one hundred forty-four".