28547240 has 16 divisors (see below), whose sum is σ = 64231380. Its totient is φ = 11418880.

The previous prime is 28547237. The next prime is 28547251. The reversal of 28547240 is 4274582.

It can be written as a sum of positive squares in 2 ways, for example, as 27102436 + 1444804 = 5206^2 + 1202^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28547197 and 28547206.

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, 356801 + ... + 356880.

Almost surely, 2^28547240 is an apocalyptic number.

28547240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28547240 is an abundant number, since it is smaller than the sum of its proper divisors (35684140).

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

28547240 is a wasteful number, since it uses less digits than its factorization.

28547240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 713692 (or 713688 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 32.

The square root of 28547240 is about 5342.9617254852. The cubic root of 28547240 is about 305.6244128136.

The spelling of 28547240 in words is "twenty-eight million, five hundred forty-seven thousand, two hundred forty".