28539436 has 6 divisors (see below), whose sum is σ = 49944020. Its totient is φ = 14269716.

The previous prime is 28539431. The next prime is 28539449. The reversal of 28539436 is 63493582.

It is not an unprimeable number, because it can be changed into a prime (28539431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3567426 + ... + 3567433.

Almost surely, 2^28539436 is an apocalyptic number.

It is an amenable number.

28539436 is a deficient number, since it is larger than the sum of its proper divisors (21404584).

28539436 is a wasteful number, since it uses less digits than its factorization.

28539436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7134863 (or 7134861 counting only the distinct ones).

The product of its digits is 155520, while the sum is 40.

The square root of 28539436 is about 5342.2313690068. The cubic root of 28539436 is about 305.5965606139.

The spelling of 28539436 in words is "twenty-eight million, five hundred thirty-nine thousand, four hundred thirty-six".