28039541 has 2 divisors, whose sum is σ = 28039542. Its totient is φ = 28039540.

The previous prime is 28039523. The next prime is 28039547. The reversal of 28039541 is 14593082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15437041 + 12602500 = 3929^2 + 3550^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28039541 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28039498 and 28039507.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28039547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14019770 + 14019771.

It is an arithmetic number, because the mean of its divisors is an integer number (14019771).

Almost surely, 2^28039541 is an apocalyptic number.

It is an amenable number.

28039541 is a deficient number, since it is larger than the sum of its proper divisors (1).

28039541 is an equidigital number, since it uses as much as digits as its factorization.

28039541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 28039541 is about 5295.2375772953. The cubic root of 28039541 is about 303.8017701505.

The spelling of 28039541 in words is "twenty-eight million, thirty-nine thousand, five hundred forty-one".