28710725 has 18 divisors (see below), whose sum is σ = 37014930. Its totient is φ = 22065120.

The previous prime is 28710707. The next prime is 28710727. The reversal of 28710725 is 52701782.

It can be written as a sum of positive squares in 3 ways, for example, as 1940449 + 26770276 = 1393^2 + 5174^2 .

It is not a de Polignac number, because 28710725 - 2⁸ = 28710469 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28710691 and 28710700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28710727) by changing a digit.

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 17 ways as a sum of consecutive naturals, for example, 144176 + ... + 144374.

It is an arithmetic number, because the mean of its divisors is an integer number (2056385).

Almost surely, 2^28710725 is an apocalyptic number.

28710725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28710725 is a deficient number, since it is larger than the sum of its proper divisors (8304205).

28710725 is an equidigital number, since it uses as much as digits as its factorization.

28710725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437 (or 233 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 32.

The square root of 28710725 is about 5358.2389830988. The cubic root of 28710725 is about 306.2067216366.

The spelling of 28710725 in words is "twenty-eight million, seven hundred ten thousand, seven hundred twenty-five".