28471913 has 2 divisors, whose sum is σ = 28471914. Its totient is φ = 28471912.

The previous prime is 28471903. The next prime is 28471943. The reversal of 28471913 is 31917482.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19963024 + 8508889 = 4468^2 + 2917^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28471913 is a prime.

It is not a weakly prime, because it can be changed into another prime (28471903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14235956 + 14235957.

It is an arithmetic number, because the mean of its divisors is an integer number (14235957).

Almost surely, 2^28471913 is an apocalyptic number.

It is an amenable number.

28471913 is a deficient number, since it is larger than the sum of its proper divisors (1).

28471913 is an equidigital number, since it uses as much as digits as its factorization.

28471913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 35.

The square root of 28471913 is about 5335.9078890101. The cubic root of 28471913 is about 305.3553611306.

The spelling of 28471913 in words is "twenty-eight million, four hundred seventy-one thousand, nine hundred thirteen".