28249020 has 48 divisors (see below), whose sum is σ = 87887520. Its totient is φ = 7532928.

The previous prime is 28248977. The next prime is 28249027. The reversal of 28249020 is 2094282.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28249027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25617 + ... + 26696.

It is an arithmetic number, because the mean of its divisors is an integer number (1830990).

Almost surely, 2^28249020 is an apocalyptic number.

28249020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28249020 is an abundant number, since it is smaller than the sum of its proper divisors (59638500).

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

28249020 is a wasteful number, since it uses less digits than its factorization.

28249020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52331 (or 52323 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 28249020 is about 5314.9807149227. The cubic root of 28249020 is about 304.5564456499.

The spelling of 28249020 in words is "twenty-eight million, two hundred forty-nine thousand, twenty".