28108978903 has 2 divisors, whose sum is σ = 28108978904. Its totient is φ = 28108978902.

The previous prime is 28108978901. The next prime is 28108978979. The reversal of 28108978903 is 30987980182.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28108978903 - 2¹ = 28108978901 is a prime.

It is a super-2 number, since 2×28108978903² (a number of 22 digits) contains 22 as substring.

Together with 28108978901, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28108978901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14054489451 + 14054489452.

It is an arithmetic number, because the mean of its divisors is an integer number (14054489452).

Almost surely, 2^28108978903 is an apocalyptic number.

28108978903 is a deficient number, since it is larger than the sum of its proper divisors (1).

28108978903 is an equidigital number, since it uses as much as digits as its factorization.

28108978903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1741824, while the sum is 55.

The spelling of 28108978903 in words is "twenty-eight billion, one hundred eight million, nine hundred seventy-eight thousand, nine hundred three".