28178888053 has 4 divisors (see below), whose sum is σ = 28940479660. Its totient is φ = 27417296448.

The previous prime is 28178888051. The next prime is 28178888057. The reversal of 28178888053 is 35088887182.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35088887182 = 2 ⋅17544443591.

It can be written as a sum of positive squares in 2 ways, for example, as 27125431204 + 1053456849 = 164698^2 + 32457^2 .

It is a cyclic number.

It is not a de Polignac number, because 28178888053 - 2¹ = 28178888051 is a prime.

It is a super-2 number, since 2×28178888053² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28178888051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 380795748 + ... + 380795821.

It is an arithmetic number, because the mean of its divisors is an integer number (7235119915).

Almost surely, 2^28178888053 is an apocalyptic number.

It is an amenable number.

28178888053 is a deficient number, since it is larger than the sum of its proper divisors (761591607).

28178888053 is an equidigital number, since it uses as much as digits as its factorization.

28178888053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 761591606.

The product of its (nonzero) digits is 6881280, while the sum is 58.

The spelling of 28178888053 in words is "twenty-eight billion, one hundred seventy-eight million, eight hundred eighty-eight thousand, fifty-three".