28494920 has 32 divisors (see below), whose sum is σ = 65328120. Its totient is φ = 11182080.

The previous prime is 28494913. The next prime is 28494923. The reversal of 28494920 is 2949482.

It can be written as a sum of positive squares in 4 ways, for example, as 20666116 + 7828804 = 4546^2 + 2798^2 .

It is not an unprimeable number, because it can be changed into a prime (28494923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4601 + ... + 8840.

Almost surely, 2^28494920 is an apocalyptic number.

28494920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28494920 is an abundant number, since it is smaller than the sum of its proper divisors (36833200).

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

28494920 is a wasteful number, since it uses less digits than its factorization.

28494920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13505 (or 13501 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 28494920 is about 5338.0633192198. The cubic root of 28494920 is about 305.4375874209.

The spelling of 28494920 in words is "twenty-eight million, four hundred ninety-four thousand, nine hundred twenty".