28802538 has 12 divisors (see below), whose sum is σ = 62405538. Its totient is φ = 9600840.

The previous prime is 28802513. The next prime is 28802567. The reversal of 28802538 is 83520882.

It can be written as a sum of positive squares in only one way, i.e., 23590449 + 5212089 = 4857^2 + 2283^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 800053 + ... + 800088.

Almost surely, 2^28802538 is an apocalyptic number.

28802538 is an abundant number, since it is smaller than the sum of its proper divisors (33603000).

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

28802538 is a wasteful number, since it uses less digits than its factorization.

28802538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1600149 (or 1600146 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 28802538 is about 5366.7996049787. The cubic root of 28802538 is about 306.5327768288.

The spelling of 28802538 in words is "twenty-eight million, eight hundred two thousand, five hundred thirty-eight".