28748939 has 2 divisors, whose sum is σ = 28748940. Its totient is φ = 28748938.

The previous prime is 28748927. The next prime is 28748971. The reversal of 28748939 is 93984782.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28748939 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (28748039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14374469 + 14374470.

It is an arithmetic number, because the mean of its divisors is an integer number (14374470).

Almost surely, 2^28748939 is an apocalyptic number.

28748939 is a deficient number, since it is larger than the sum of its proper divisors (1).

28748939 is an equidigital number, since it uses as much as digits as its factorization.

28748939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 50.

The square root of 28748939 is about 5361.8037077088. The cubic root of 28748939 is about 306.3425152118.

The spelling of 28748939 in words is "twenty-eight million, seven hundred forty-eight thousand, nine hundred thirty-nine".