28731284 has 12 divisors (see below), whose sum is σ = 50327508. Its totient is φ = 14352000.

The previous prime is 28731281. The next prime is 28731293. The reversal of 28731284 is 48213782.

It can be written as a sum of positive squares in 2 ways, for example, as 2496400 + 26234884 = 1580^2 + 5122^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28731281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2444 + ... + 7964.

It is an arithmetic number, because the mean of its divisors is an integer number (4193959).

Almost surely, 2^28731284 is an apocalyptic number.

It is an amenable number.

28731284 is a deficient number, since it is larger than the sum of its proper divisors (21596224).

28731284 is a wasteful number, since it uses less digits than its factorization.

28731284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6826 (or 6824 counting only the distinct ones).

The product of its digits is 21504, while the sum is 35.

The square root of 28731284 is about 5360.1570872503. The cubic root of 28731284 is about 306.2797930754.

The spelling of 28731284 in words is "twenty-eight million, seven hundred thirty-one thousand, two hundred eighty-four".