28743638 has 16 divisors (see below), whose sum is σ = 53754624. Its totient is φ = 11198760.

The previous prime is 28743619. The next prime is 28743643. The reversal of 28743638 is 83634782.

It is a junction number, because it is equal to n+sod(n) for n = 28743595 and 28743604.

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, 93170 + ... + 93477.

It is an arithmetic number, because the mean of its divisors is an integer number (3359664).

Almost surely, 2^28743638 is an apocalyptic number.

28743638 is a deficient number, since it is larger than the sum of its proper divisors (25010986).

28743638 is a wasteful number, since it uses less digits than its factorization.

28743638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186667.

The product of its digits is 193536, while the sum is 41.

The square root of 28743638 is about 5361.3093549990. The cubic root of 28743638 is about 306.3236852822.

The spelling of 28743638 in words is "twenty-eight million, seven hundred forty-three thousand, six hundred thirty-eight".