28240490 has 16 divisors (see below), whose sum is σ = 52586280. Its totient is φ = 10906560.

The previous prime is 28240489. The next prime is 28240493. The reversal of 28240490 is 9404282.

It can be written as a sum of positive squares in 4 ways, for example, as 26204161 + 2036329 = 5119^2 + 1427^2 .

It is a Harshad number since it is a multiple of its sum of digits (29).

It is not an unprimeable number, because it can be changed into a prime (28240493) 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, 48401 + ... + 48980.

Almost surely, 2^28240490 is an apocalyptic number.

28240490 is a deficient number, since it is larger than the sum of its proper divisors (24345790).

28240490 is a wasteful number, since it uses less digits than its factorization.

28240490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97417.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 28240490 is about 5314.1782055178. The cubic root of 28240490 is about 304.5257882087.

The spelling of 28240490 in words is "twenty-eight million, two hundred forty thousand, four hundred ninety".