28432638 has 24 divisors (see below), whose sum is σ = 66343368. Its totient is φ = 8748432.

The previous prime is 28432637. The next prime is 28432643. The reversal of 28432638 is 83623482.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28432637) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60520 + ... + 60987.

It is an arithmetic number, because the mean of its divisors is an integer number (2764307).

Almost surely, 2^28432638 is an apocalyptic number.

28432638 is an abundant number, since it is smaller than the sum of its proper divisors (37910730).

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

28432638 is a wasteful number, since it uses less digits than its factorization.

28432638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121528 (or 121525 counting only the distinct ones).

The product of its digits is 55296, while the sum is 36.

The square root of 28432638 is about 5332.2263642872. The cubic root of 28432638 is about 305.2148911118.

The spelling of 28432638 in words is "twenty-eight million, four hundred thirty-two thousand, six hundred thirty-eight".