28432913 has 2 divisors, whose sum is σ = 28432914. Its totient is φ = 28432912.

The previous prime is 28432889. The next prime is 28432981. The reversal of 28432913 is 31923482.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26450449 + 1982464 = 5143^2 + 1408^2 .

It is a cyclic number.

It is not a de Polignac number, because 28432913 - 2¹⁰ = 28431889 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28432913.

It is not a weakly prime, because it can be changed into another prime (28432013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14216456 + 14216457.

It is an arithmetic number, because the mean of its divisors is an integer number (14216457).

Almost surely, 2^28432913 is an apocalyptic number.

It is an amenable number.

28432913 is a deficient number, since it is larger than the sum of its proper divisors (1).

28432913 is an equidigital number, since it uses as much as digits as its factorization.

28432913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 32.

The square root of 28432913 is about 5332.2521508271. The cubic root of 28432913 is about 305.2158751198.

The spelling of 28432913 in words is "twenty-eight million, four hundred thirty-two thousand, nine hundred thirteen".