28786490 has 16 divisors (see below), whose sum is σ = 51943680. Its totient is φ = 11486160.

The previous prime is 28786487. The next prime is 28786493. The reversal of 28786490 is 9468782.

It is an interprime number because it is at equal distance from previous prime (28786487) and next prime (28786493).

It is not an unprimeable number, because it can be changed into a prime (28786493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 971 + ... + 7649.

It is an arithmetic number, because the mean of its divisors is an integer number (3246480).

Almost surely, 2^28786490 is an apocalyptic number.

28786490 is a deficient number, since it is larger than the sum of its proper divisors (23157190).

28786490 is a wasteful number, since it uses less digits than its factorization.

28786490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7117.

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 28786490 is about 5365.3042784170. The cubic root of 28786490 is about 306.4758356441.

The spelling of 28786490 in words is "twenty-eight million, seven hundred eighty-six thousand, four hundred ninety".