28293638 has 8 divisors (see below), whose sum is σ = 43809600. Its totient is φ = 13690440.

The previous prime is 28293619. The next prime is 28293653. The reversal of 28293638 is 83639282.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28293595 and 28293604.

It is a congruent number.

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, 228113 + ... + 228236.

It is an arithmetic number, because the mean of its divisors is an integer number (5476200).

Almost surely, 2^28293638 is an apocalyptic number.

28293638 is a deficient number, since it is larger than the sum of its proper divisors (15515962).

28293638 is a wasteful number, since it uses less digits than its factorization.

28293638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456382.

The product of its digits is 124416, while the sum is 41.

The square root of 28293638 is about 5319.1764400140. The cubic root of 28293638 is about 304.7167055046.

The spelling of 28293638 in words is "twenty-eight million, two hundred ninety-three thousand, six hundred thirty-eight".