28200520 has 16 divisors (see below), whose sum is σ = 63451260. Its totient is φ = 11280192.

The previous prime is 28200509. The next prime is 28200533. The reversal of 28200520 is 2500282.

It can be written as a sum of positive squares in 2 ways, for example, as 27436644 + 763876 = 5238^2 + 874^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 352467 + ... + 352546.

Almost surely, 2^28200520 is an apocalyptic number.

28200520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28200520 is an abundant number, since it is smaller than the sum of its proper divisors (35250740).

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

28200520 is a wasteful number, since it uses less digits than its factorization.

28200520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 705024 (or 705020 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 28200520 is about 5310.4161795475. The cubic root of 28200520 is about 304.3820508214.

The spelling of 28200520 in words is "twenty-eight million, two hundred thousand, five hundred twenty".