28872490 has 16 divisors (see below), whose sum is σ = 52556040. Its totient is φ = 11418880.

The previous prime is 28872461. The next prime is 28872497. The reversal of 28872490 is 9427882.

It can be written as a sum of positive squares in 4 ways, for example, as 25512601 + 3359889 = 5051^2 + 1833^2 .

It is not an unprimeable number, because it can be changed into a prime (28872497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15331 + ... + 17110.

Almost surely, 2^28872490 is an apocalyptic number.

28872490 is a deficient number, since it is larger than the sum of its proper divisors (23683550).

28872490 is a wasteful number, since it uses less digits than its factorization.

28872490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32537.

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 28872490 is about 5373.3127584387. The cubic root of 28872490 is about 306.7807323523.

The spelling of 28872490 in words is "twenty-eight million, eight hundred seventy-two thousand, four hundred ninety".