28307020 has 96 divisors (see below), whose sum is σ = 72576000. Its totient is φ = 9064704.

The previous prime is 28307011. The next prime is 28307033. The reversal of 28307020 is 2070382.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 28306982 and 28307000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 189906 + ... + 190054.

It is an arithmetic number, because the mean of its divisors is an integer number (756000).

Almost surely, 2^28307020 is an apocalyptic number.

28307020 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 28307020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36288000).

28307020 is an abundant number, since it is smaller than the sum of its proper divisors (44268980).

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

28307020 is a wasteful number, since it uses less digits than its factorization.

28307020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247 (or 245 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 28307020 is about 5320.4341928080. The cubic root of 28307020 is about 304.7647384022.

The spelling of 28307020 in words is "twenty-eight million, three hundred seven thousand, twenty".