28126403787 has 6 divisors (see below), whose sum is σ = 37502259028. Its totient is φ = 18750742204.

The previous prime is 28126403777. The next prime is 28126403791. The reversal of 28126403787 is 78730462182.

It is not a de Polignac number, because 28126403787 - 2⁴ = 28126403771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28126403777) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 242068 + ... + 338894.

Almost surely, 2^28126403787 is an apocalyptic number.

28126403787 is a deficient number, since it is larger than the sum of its proper divisors (9375855241).

28126403787 is an frugal number, since it uses more digits than its factorization.

28126403787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193657 (or 96830 counting only the distinct ones).

The product of its (nonzero) digits is 903168, while the sum is 48.

Multiplying 28126403787 by its sum of digits (48), we get a square (1350067381776 = 1161924²).

The spelling of 28126403787 in words is "twenty-eight billion, one hundred twenty-six million, four hundred three thousand, seven hundred eighty-seven".