28025320 has 16 divisors (see below), whose sum is σ = 63057060. Its totient is φ = 11210112.

The previous prime is 28025311. The next prime is 28025351. The reversal of 28025320 is 2352082.

It can be written as a sum of positive squares in 2 ways, for example, as 25381444 + 2643876 = 5038^2 + 1626^2 .

It is a super-2 number, since 2×28025320² = 1570837122204800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28025291 and 28025300.

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 3 ways as a sum of consecutive naturals, for example, 350277 + ... + 350356.

Almost surely, 2^28025320 is an apocalyptic number.

28025320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28025320 is an abundant number, since it is smaller than the sum of its proper divisors (35031740).

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

28025320 is a wasteful number, since it uses less digits than its factorization.

28025320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 700644 (or 700640 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 28025320 is about 5293.8945966084. The cubic root of 28025320 is about 303.7504010788.

It can be divided in two parts, 280 and 25320, that added together give a square (25600 = 160²).

The spelling of 28025320 in words is "twenty-eight million, twenty-five thousand, three hundred twenty".