28425641 has 4 divisors (see below), whose sum is σ = 28438212. Its totient is φ = 28413072.

The previous prime is 28425637. The next prime is 28425643. The reversal of 28425641 is 14652482.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 19545241 + 8880400 = 4421^2 + 2980^2 .

It is a cyclic number.

It is not a de Polignac number, because 28425641 - 2² = 28425637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28425598 and 28425607.

It is not an unprimeable number, because it can be changed into a prime (28425643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1850 + ... + 7763.

It is an arithmetic number, because the mean of its divisors is an integer number (7109553).

Almost surely, 2^28425641 is an apocalyptic number.

It is an amenable number.

28425641 is a deficient number, since it is larger than the sum of its proper divisors (12571).

28425641 is an equidigital number, since it uses as much as digits as its factorization.

28425641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12570.

The product of its digits is 15360, while the sum is 32.

The square root of 28425641 is about 5331.5702189880. The cubic root of 28425641 is about 305.1898522369.

The spelling of 28425641 in words is "twenty-eight million, four hundred twenty-five thousand, six hundred forty-one".