28752740 has 24 divisors (see below), whose sum is σ = 61007352. Its totient is φ = 11381760.

The previous prime is 28752739. The next prime is 28752743. The reversal of 28752740 is 4725782.

It can be written as a sum of positive squares in 4 ways, for example, as 1982464 + 26770276 = 1408^2 + 5174^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28752740.

It is not an unprimeable number, because it can be changed into a prime (28752743) 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, 5471 + ... + 9350.

It is an arithmetic number, because the mean of its divisors is an integer number (2541973).

Almost surely, 2^28752740 is an apocalyptic number.

28752740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28752740 is an abundant number, since it is smaller than the sum of its proper divisors (32254612).

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

28752740 is a wasteful number, since it uses less digits than its factorization.

28752740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14927 (or 14925 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 35.

The square root of 28752740 is about 5362.1581476118. The cubic root of 28752740 is about 306.3560154965.

It can be divided in two parts, 28752 and 740, that added together give a palindrome (29492).

The spelling of 28752740 in words is "twenty-eight million, seven hundred fifty-two thousand, seven hundred forty".