28001436 has 24 divisors (see below), whose sum is σ = 65494800. Its totient is φ = 9311232.

The previous prime is 28001417. The next prime is 28001473. The reversal of 28001436 is 63410082.

It is a happy number.

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, 2790 + ... + 7986.

It is an arithmetic number, because the mean of its divisors is an integer number (2728950).

Almost surely, 2^28001436 is an apocalyptic number.

It is an amenable number.

28001436 is an abundant number, since it is smaller than the sum of its proper divisors (37493364).

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

28001436 is a wasteful number, since it uses less digits than its factorization.

28001436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5653 (or 5651 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 28001436 is about 5291.6383096353. The cubic root of 28001436 is about 303.6640882200.

The spelling of 28001436 in words is "twenty-eight million, one thousand, four hundred thirty-six".