28904715109 has 2 divisors, whose sum is σ = 28904715110. Its totient is φ = 28904715108.

The previous prime is 28904715101. The next prime is 28904715139. The reversal of 28904715109 is 90151740982.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27300952900 + 1603762209 = 165230^2 + 40047^2 .

It is a cyclic number.

It is not a de Polignac number, because 28904715109 - 2³ = 28904715101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28904715101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14452357554 + 14452357555.

It is an arithmetic number, because the mean of its divisors is an integer number (14452357555).

Almost surely, 2^28904715109 is an apocalyptic number.

It is an amenable number.

28904715109 is a deficient number, since it is larger than the sum of its proper divisors (1).

28904715109 is an equidigital number, since it uses as much as digits as its factorization.

28904715109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 181440, while the sum is 46.

The spelling of 28904715109 in words is "twenty-eight billion, nine hundred four million, seven hundred fifteen thousand, one hundred nine".