28873020 has 144 divisors (see below), whose sum is σ = 91967904. Its totient is φ = 6758400.

The previous prime is 28873003. The next prime is 28873037. The reversal of 28873020 is 2037882.

It is an interprime number because it is at equal distance from previous prime (28873003) and next prime (28873037).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 297612 + ... + 297708.

It is an arithmetic number, because the mean of its divisors is an integer number (638666).

Almost surely, 2^28873020 is an apocalyptic number.

28873020 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 28873020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45983952).

28873020 is an abundant number, since it is smaller than the sum of its proper divisors (63094884).

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

28873020 is a wasteful number, since it uses less digits than its factorization.

28873020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172 (or 159 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 28873020 is about 5373.3620760191. The cubic root of 28873020 is about 306.7826094886.

The spelling of 28873020 in words is "twenty-eight million, eight hundred seventy-three thousand, twenty".