28267540 has 24 divisors (see below), whose sum is σ = 67842432. Its totient is φ = 9691680.

The previous prime is 28267537. The next prime is 28267553. The reversal of 28267540 is 4576282.

It is a junction number, because it is equal to n+sod(n) for n = 28267496 and 28267505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100816 + ... + 101095.

It is an arithmetic number, because the mean of its divisors is an integer number (2826768).

Almost surely, 2^28267540 is an apocalyptic number.

28267540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28267540 is an abundant number, since it is smaller than the sum of its proper divisors (39574892).

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

28267540 is a wasteful number, since it uses less digits than its factorization.

28267540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201927 (or 201925 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 34.

The square root of 28267540 is about 5316.7226747311. The cubic root of 28267540 is about 304.6229866392.

The spelling of 28267540 in words is "twenty-eight million, two hundred sixty-seven thousand, five hundred forty".