28625140 has 12 divisors (see below), whose sum is σ = 60112836. Its totient is φ = 11450048.

The previous prime is 28625131. The next prime is 28625171. The reversal of 28625140 is 4152682.

It can be written as a sum of positive squares in 2 ways, for example, as 22335076 + 6290064 = 4726^2 + 2508^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28625099 and 28625108.

It is a congruent number.

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, 715609 + ... + 715648.

It is an arithmetic number, because the mean of its divisors is an integer number (5009403).

Almost surely, 2^28625140 is an apocalyptic number.

28625140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28625140 is an abundant number, since it is smaller than the sum of its proper divisors (31487696).

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

28625140 is a wasteful number, since it uses less digits than its factorization.

28625140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1431266 (or 1431264 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 28625140 is about 5350.2467232830. The cubic root of 28625140 is about 305.9021573353.

The spelling of 28625140 in words is "twenty-eight million, six hundred twenty-five thousand, one hundred forty".