28913508 has 36 divisors (see below), whose sum is σ = 78710268. Its totient is φ = 8896320.

The previous prime is 28913491. The next prime is 28913527. The reversal of 28913508 is 80531982.

It can be written as a sum of positive squares in 2 ways, for example, as 1790244 + 27123264 = 1338^2 + 5208^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30423 + ... + 31358.

Almost surely, 2^28913508 is an apocalyptic number.

It is an amenable number.

28913508 is an abundant number, since it is smaller than the sum of its proper divisors (49796760).

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

28913508 is a wasteful number, since it uses less digits than its factorization.

28913508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61804 (or 61799 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 28913508 is about 5377.1282298268. The cubic root of 28913508 is about 306.9259406781.

The spelling of 28913508 in words is "twenty-eight million, nine hundred thirteen thousand, five hundred eight".