28701828 has 18 divisors (see below), whose sum is σ = 72551934. Its totient is φ = 9567264.

The previous prime is 28701817. The next prime is 28701839. The reversal of 28701828 is 82810782.

It is an interprime number because it is at equal distance from previous prime (28701817) and next prime (28701839).

It can be written as a sum of positive squares in only one way, i.e., 19079424 + 9622404 = 4368^2 + 3102^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 797273 = 28701828 / (2 + 8 + 7 + 0 + 1 + 8 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 28701792 and 28701801.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 398601 + ... + 398672.

It is an arithmetic number, because the mean of its divisors is an integer number (4030663).

Almost surely, 2^28701828 is an apocalyptic number.

It is an amenable number.

28701828 is an abundant number, since it is smaller than the sum of its proper divisors (43850106).

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

28701828 is a wasteful number, since it uses less digits than its factorization.

28701828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 797283 (or 797278 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 36.

The square root of 28701828 is about 5357.4087019752. The cubic root of 28701828 is about 306.1750888274.

The spelling of 28701828 in words is "twenty-eight million, seven hundred one thousand, eight hundred twenty-eight".