28142505128 has 8 divisors (see below), whose sum is σ = 52767197130. Its totient is φ = 14071252560.

The previous prime is 28142505091. The next prime is 28142505151. The reversal of 28142505128 is 82150524182.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 27099085924 + 1043419204 = 164618^2 + 32302^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 28142505091 and 28142505100.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1758906563 + ... + 1758906578.

Almost surely, 2^28142505128 is an apocalyptic number.

It is an amenable number.

28142505128 is a deficient number, since it is larger than the sum of its proper divisors (24624692002).

28142505128 is a wasteful number, since it uses less digits than its factorization.

28142505128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3517813147 (or 3517813143 counting only the distinct ones).

The product of its (nonzero) digits is 51200, while the sum is 38.

The spelling of 28142505128 in words is "twenty-eight billion, one hundred forty-two million, five hundred five thousand, one hundred twenty-eight".