28752020 has 54 divisors (see below), whose sum is σ = 66981726. Its totient is φ = 10359360.

The previous prime is 28752019. The next prime is 28752037. The reversal of 28752020 is 2025782.

It can be written as a sum of positive squares in 3 ways, for example, as 7203856 + 21548164 = 2684^2 + 4642^2 .

It is a congruent number.

It is an unprimeable number.

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 17 ways as a sum of consecutive naturals, for example, 263726 + ... + 263834.

Almost surely, 2^28752020 is an apocalyptic number.

28752020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28752020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33490863).

28752020 is an abundant number, since it is smaller than the sum of its proper divisors (38229706).

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

28752020 is a wasteful number, since it uses less digits than its factorization.

28752020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249 (or 127 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 28752020 is about 5362.0910100445. The cubic root of 28752020 is about 306.3534583122.

The spelling of 28752020 in words is "twenty-eight million, seven hundred fifty-two thousand, twenty".