28752540 has 24 divisors (see below), whose sum is σ = 80507280. Its totient is φ = 7667328.

The previous prime is 28752523. The next prime is 28752541. The reversal of 28752540 is 4525782.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28752541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 239545 + ... + 239664.

It is an arithmetic number, because the mean of its divisors is an integer number (3354470).

Almost surely, 2^28752540 is an apocalyptic number.

28752540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28752540 is an abundant number, since it is smaller than the sum of its proper divisors (51754740).

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

28752540 is a wasteful number, since it uses less digits than its factorization.

28752540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 479221 (or 479219 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 33.

The square root of 28752540 is about 5362.1394983719. The cubic root of 28752540 is about 306.3553051718.

It can be divided in two parts, 28752 and 540, that added together give a palindrome (29292).

The spelling of 28752540 in words is "twenty-eight million, seven hundred fifty-two thousand, five hundred forty".