28535820 has 24 divisors (see below), whose sum is σ = 79900464. Its totient is φ = 7609536.

The previous prime is 28535813. The next prime is 28535839. The reversal of 28535820 is 2853582.

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, 237739 + ... + 237858.

It is an arithmetic number, because the mean of its divisors is an integer number (3329186).

Almost surely, 2^28535820 is an apocalyptic number.

28535820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28535820 is an abundant number, since it is smaller than the sum of its proper divisors (51364644).

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

28535820 is a wasteful number, since it uses less digits than its factorization.

28535820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475609 (or 475607 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 33.

The square root of 28535820 is about 5341.8929229254. The cubic root of 28535820 is about 305.5836535165.

The spelling of 28535820 in words is "twenty-eight million, five hundred thirty-five thousand, eight hundred twenty".