28441638 has 32 divisors (see below), whose sum is σ = 63554400. Its totient is φ = 9427968.

The previous prime is 28441631. The next prime is 28441657. The reversal of 28441638 is 83614482.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28441631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9058 + ... + 11786.

It is an arithmetic number, because the mean of its divisors is an integer number (1986075).

Almost surely, 2^28441638 is an apocalyptic number.

28441638 is an abundant number, since it is smaller than the sum of its proper divisors (35112762).

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

28441638 is a wasteful number, since it uses less digits than its factorization.

28441638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2933 (or 2927 counting only the distinct ones).

The product of its digits is 36864, while the sum is 36.

The square root of 28441638 is about 5333.0702226766. The cubic root of 28441638 is about 305.2470917145.

The spelling of 28441638 in words is "twenty-eight million, four hundred forty-one thousand, six hundred thirty-eight".