28303020 has 60 divisors (see below), whose sum is σ = 88792704. Its totient is φ = 7547040.

The previous prime is 28303019. The next prime is 28303021. The reversal of 28303020 is 2030382.

It is an interprime number because it is at equal distance from previous prime (28303019) and next prime (28303021).

It is a tau number, because it is divible by the number of its divisors (60).

It is a super-2 number, since 2×28303020² = 1602121882240800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 28302984 and 28303002.

It is not an unprimeable number, because it can be changed into a prime (28303021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 7116 + ... + 10355.

Almost surely, 2^28303020 is an apocalyptic number.

28303020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28303020 is an abundant number, since it is smaller than the sum of its proper divisors (60489684).

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

28303020 is a wasteful number, since it uses less digits than its factorization.

28303020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17492 (or 17481 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 28303020 is about 5320.0582703576. The cubic root of 28303020 is about 304.7503825241.

The spelling of 28303020 in words is "twenty-eight million, three hundred three thousand, twenty".