28043638 has 16 divisors (see below), whose sum is σ = 49733280. Its totient is φ = 11604096.

The previous prime is 28043627. The next prime is 28043641. The reversal of 28043638 is 83634082.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34131 + ... + 34942.

It is an arithmetic number, because the mean of its divisors is an integer number (3108330).

Almost surely, 2^28043638 is an apocalyptic number.

28043638 is a deficient number, since it is larger than the sum of its proper divisors (21689642).

28043638 is a wasteful number, since it uses less digits than its factorization.

28043638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69111.

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 28043638 is about 5295.6244202171. The cubic root of 28043638 is about 303.8165661040.

The spelling of 28043638 in words is "twenty-eight million, forty-three thousand, six hundred thirty-eight".