28747949 has 2 divisors, whose sum is σ = 28747950. Its totient is φ = 28747948.

The previous prime is 28747921. The next prime is 28747981. The reversal of 28747949 is 94974782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23716900 + 5031049 = 4870^2 + 2243^2 .

It is a cyclic number.

It is not a de Polignac number, because 28747949 - 2¹⁶ = 28682413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28747897 and 28747906.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28744949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14373974 + 14373975.

It is an arithmetic number, because the mean of its divisors is an integer number (14373975).

Almost surely, 2^28747949 is an apocalyptic number.

It is an amenable number.

28747949 is a deficient number, since it is larger than the sum of its proper divisors (1).

28747949 is an equidigital number, since it uses as much as digits as its factorization.

28747949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1016064, while the sum is 50.

The square root of 28747949 is about 5361.7113872345. The cubic root of 28747949 is about 306.3389987624.

The spelling of 28747949 in words is "twenty-eight million, seven hundred forty-seven thousand, nine hundred forty-nine".