28049620 has 24 divisors (see below), whose sum is σ = 59286024. Its totient is φ = 11147136.

The previous prime is 28049611. The next prime is 28049633. The reversal of 28049620 is 2694082.

It can be written as a sum of positive squares in 4 ways, for example, as 213444 + 27836176 = 462^2 + 5276^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1327 + ... + 7606.

It is an arithmetic number, because the mean of its divisors is an integer number (2470251).

Almost surely, 2^28049620 is an apocalyptic number.

28049620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28049620 is an abundant number, since it is smaller than the sum of its proper divisors (31236404).

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

28049620 is a wasteful number, since it uses less digits than its factorization.

28049620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9099 (or 9097 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 28049620 is about 5296.1891960163. The cubic root of 28049620 is about 303.8381669806.

The spelling of 28049620 in words is "twenty-eight million, forty-nine thousand, six hundred twenty".