28204920 has 48 divisors (see below), whose sum is σ = 91667160. Its totient is φ = 7521216.

The previous prime is 28204903. The next prime is 28204927. The reversal of 28204920 is 2940282.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28204927) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38814 + ... + 39533.

Almost surely, 2^28204920 is an apocalyptic number.

28204920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28204920 is an abundant number, since it is smaller than the sum of its proper divisors (63462240).

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

28204920 is a wasteful number, since it uses less digits than its factorization.

28204920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78364 (or 78357 counting only the distinct ones).

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

The square root of 28204920 is about 5310.8304435371. The cubic root of 28204920 is about 304.3978804512.

The spelling of 28204920 in words is "twenty-eight million, two hundred four thousand, nine hundred twenty".