28137428 has 12 divisors (see below), whose sum is σ = 53716992. Its totient is φ = 12789720.

The previous prime is 28137419. The next prime is 28137433. The reversal of 28137428 is 82473182.

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, 319700 + ... + 319787.

It is an arithmetic number, because the mean of its divisors is an integer number (4476416).

Almost surely, 2^28137428 is an apocalyptic number.

It is an amenable number.

28137428 is a deficient number, since it is larger than the sum of its proper divisors (25579564).

28137428 is a wasteful number, since it uses less digits than its factorization.

28137428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639502 (or 639500 counting only the distinct ones).

The product of its digits is 21504, while the sum is 35.

The square root of 28137428 is about 5304.4724525630. The cubic root of 28137428 is about 304.1548870232.

The spelling of 28137428 in words is "twenty-eight million, one hundred thirty-seven thousand, four hundred twenty-eight".