28787020 has 24 divisors (see below), whose sum is σ = 61055568. Its totient is φ = 11400000.

The previous prime is 28786997. The next prime is 28787023. The reversal of 28787020 is 2078782.

It is not an unprimeable number, because it can be changed into a prime (28787023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5106 + ... + 9145.

It is an arithmetic number, because the mean of its divisors is an integer number (2543982).

Almost surely, 2^28787020 is an apocalyptic number.

28787020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28787020 is an abundant number, since it is smaller than the sum of its proper divisors (32268548).

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

28787020 is a wasteful number, since it uses less digits than its factorization.

28787020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14361 (or 14359 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 34.

The square root of 28787020 is about 5365.3536696102. The cubic root of 28787020 is about 306.4777165171.

The spelling of 28787020 in words is "twenty-eight million, seven hundred eighty-seven thousand, twenty".