28815949 has 2 divisors, whose sum is σ = 28815950. Its totient is φ = 28815948.

The previous prime is 28815931. The next prime is 28815967. The reversal of 28815949 is 94951882.

It is a balanced prime because it is at equal distance from previous prime (28815931) and next prime (28815967).

It can be written as a sum of positive squares in only one way, i.e., 27144100 + 1671849 = 5210^2 + 1293^2 .

It is a cyclic number.

It is not a de Polignac number, because 28815949 - 2¹¹ = 28813901 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28815899 and 28815908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28815929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14407974 + 14407975.

It is an arithmetic number, because the mean of its divisors is an integer number (14407975).

Almost surely, 2^28815949 is an apocalyptic number.

It is an amenable number.

28815949 is a deficient number, since it is larger than the sum of its proper divisors (1).

28815949 is an equidigital number, since it uses as much as digits as its factorization.

28815949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 46.

The square root of 28815949 is about 5368.0489006715. The cubic root of 28815949 is about 306.5803452432.

The spelling of 28815949 in words is "twenty-eight million, eight hundred fifteen thousand, nine hundred forty-nine".