28709744 has 20 divisors (see below), whose sum is σ = 63571824. Its totient is φ = 12304128.

The previous prime is 28709699. The next prime is 28709761. The reversal of 28709744 is 44790782.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

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, 128057 + ... + 128280.

Almost surely, 2^28709744 is an apocalyptic number.

It is an amenable number.

28709744 is an abundant number, since it is smaller than the sum of its proper divisors (34862080).

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

28709744 is a wasteful number, since it uses less digits than its factorization.

28709744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256352 (or 256346 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 41.

The square root of 28709744 is about 5358.1474410471. The cubic root of 28709744 is about 306.2032340640.

The spelling of 28709744 in words is "twenty-eight million, seven hundred nine thousand, seven hundred forty-four".