28709536 has 24 divisors (see below), whose sum is σ = 58472820. Its totient is φ = 13859328.

The previous prime is 28709519. The next prime is 28709573. The reversal of 28709536 is 63590782.

It can be written as a sum of positive squares in 2 ways, for example, as 27499536 + 1210000 = 5244^2 + 1100^2 .

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, 14541 + ... + 16396.

Almost surely, 2^28709536 is an apocalyptic number.

It is an amenable number.

28709536 is an abundant number, since it is smaller than the sum of its proper divisors (29763284).

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

28709536 is a wasteful number, since it uses less digits than its factorization.

28709536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30976 (or 30968 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 28709536 is about 5358.1280313184. The cubic root of 28709536 is about 306.2024945889.

The spelling of 28709536 in words is "twenty-eight million, seven hundred nine thousand, five hundred thirty-six".