28078937 has 2 divisors, whose sum is σ = 28078938. Its totient is φ = 28078936.

The previous prime is 28078907. The next prime is 28078943. The reversal of 28078937 is 73987082.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16491721 + 11587216 = 4061^2 + 3404^2 .

It is a cyclic number.

It is not a de Polignac number, because 28078937 - 2¹² = 28074841 is a prime.

It is not a weakly prime, because it can be changed into another prime (28078907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14039468 + 14039469.

It is an arithmetic number, because the mean of its divisors is an integer number (14039469).

Almost surely, 2^28078937 is an apocalyptic number.

It is an amenable number.

28078937 is a deficient number, since it is larger than the sum of its proper divisors (1).

28078937 is an equidigital number, since it uses as much as digits as its factorization.

28078937 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 169344, while the sum is 44.

The square root of 28078937 is about 5298.9562179735. The cubic root of 28078937 is about 303.9439856687.

The spelling of 28078937 in words is "twenty-eight million, seventy-eight thousand, nine hundred thirty-seven".