28905020 has 48 divisors (see below), whose sum is σ = 65415168. Its totient is φ = 10697280.

The previous prime is 28904977. The next prime is 28905053. The reversal of 28905020 is 2050982.

28905020 = T₄₆₆ + T₄₆₇ + ... + T₆₄₉.

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 15 ways as a sum of consecutive naturals, for example, 13247 + ... + 15273.

It is an arithmetic number, because the mean of its divisors is an integer number (1362816).

Almost surely, 2^28905020 is an apocalyptic number.

28905020 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 28905020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32707584).

28905020 is an abundant number, since it is smaller than the sum of its proper divisors (36510148).

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

28905020 is a wasteful number, since it uses less digits than its factorization.

28905020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2090 (or 2088 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 28905020 is about 5376.3389030083. The cubic root of 28905020 is about 306.8959034794.

The spelling of 28905020 in words is "twenty-eight million, nine hundred five thousand, twenty".