28707028 has 24 divisors (see below), whose sum is σ = 57988224. Its totient is φ = 12180000.

The previous prime is 28707017. The next prime is 28707047. The reversal of 28707028 is 82070782.

It is a junction number, because it is equal to n+sod(n) for n = 28706984 and 28707002.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2248 + ... + 7903.

It is an arithmetic number, because the mean of its divisors is an integer number (2416176).

Almost surely, 2^28707028 is an apocalyptic number.

28707028 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28707028 is an abundant number, since it is smaller than the sum of its proper divisors (29281196).

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

28707028 is a wasteful number, since it uses less digits than its factorization.

28707028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10263 (or 10261 counting only the distinct ones).

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

The square root of 28707028 is about 5357.8939892461. The cubic root of 28707028 is about 306.1935779439.

The spelling of 28707028 in words is "twenty-eight million, seven hundred seven thousand, twenty-eight".