28638384 has 20 divisors (see below), whose sum is σ = 73982616. Its totient is φ = 9546112.

The previous prime is 28638383. The next prime is 28638409. The reversal of 28638384 is 48383682.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (28638383) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 298269 + ... + 298364.

Almost surely, 2^28638384 is an apocalyptic number.

28638384 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28638384 is an abundant number, since it is smaller than the sum of its proper divisors (45344232).

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

28638384 is a wasteful number, since it uses less digits than its factorization.

28638384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 596644 (or 596638 counting only the distinct ones).

The product of its digits is 221184, while the sum is 42.

The square root of 28638384 is about 5351.4842800853. The cubic root of 28638384 is about 305.9493273348.

The spelling of 28638384 in words is "twenty-eight million, six hundred thirty-eight thousand, three hundred eighty-four".