28921020 has 24 divisors (see below), whose sum is σ = 80979024. Its totient is φ = 7712256.

The previous prime is 28921007. The next prime is 28921037. The reversal of 28921020 is 2012982.

It is a congruent number.

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, 240949 + ... + 241068.

It is an arithmetic number, because the mean of its divisors is an integer number (3374126).

Almost surely, 2^28921020 is an apocalyptic number.

28921020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28921020 is an abundant number, since it is smaller than the sum of its proper divisors (52058004).

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

28921020 is a wasteful number, since it uses less digits than its factorization.

28921020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 482029 (or 482027 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 28921020 is about 5377.8266985837. The cubic root of 28921020 is about 306.9525191205.

The spelling of 28921020 in words is "twenty-eight million, nine hundred twenty-one thousand, twenty".