28403681123 has 2 divisors, whose sum is σ = 28403681124. Its totient is φ = 28403681122.

The previous prime is 28403681101. The next prime is 28403681143. The reversal of 28403681123 is 32118630482.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28403681123 - 2¹⁴ = 28403664739 is a prime.

It is a super-2 number, since 2×28403681123² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28403681143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14201840561 + 14201840562.

It is an arithmetic number, because the mean of its divisors is an integer number (14201840562).

Almost surely, 2^28403681123 is an apocalyptic number.

28403681123 is a deficient number, since it is larger than the sum of its proper divisors (1).

28403681123 is an equidigital number, since it uses as much as digits as its factorization.

28403681123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 55296, while the sum is 38.

The spelling of 28403681123 in words is "twenty-eight billion, four hundred three million, six hundred eighty-one thousand, one hundred twenty-three".