28975240 has 32 divisors (see below), whose sum is σ = 74508480. Its totient is φ = 9934272.

The previous prime is 28975237. The next prime is 28975241. The reversal of 28975240 is 4257982.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 28975240.

It is not an unprimeable number, because it can be changed into a prime (28975241) 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, 51462 + ... + 52021.

It is an arithmetic number, because the mean of its divisors is an integer number (2328390).

Almost surely, 2^28975240 is an apocalyptic number.

28975240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28975240 is an abundant number, since it is smaller than the sum of its proper divisors (45533240).

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

28975240 is a wasteful number, since it uses less digits than its factorization.

28975240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103501 (or 103497 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 28975240 is about 5382.8654079403. The cubic root of 28975240 is about 307.1442202417.

The spelling of 28975240 in words is "twenty-eight million, nine hundred seventy-five thousand, two hundred forty".