28178888061 has 4 divisors (see below), whose sum is σ = 37571850752. Its totient is φ = 18785925372.

The previous prime is 28178888057. The next prime is 28178888071. The reversal of 28178888061 is 16088887182.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 28178888061 - 2² = 28178888057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28178887992 and 28178888010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28178888041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4696481341 + ... + 4696481346.

It is an arithmetic number, because the mean of its divisors is an integer number (9392962688).

Almost surely, 2^28178888061 is an apocalyptic number.

It is an amenable number.

28178888061 is a deficient number, since it is larger than the sum of its proper divisors (9392962691).

28178888061 is an equidigital number, since it uses as much as digits as its factorization.

28178888061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9392962690.

The product of its (nonzero) digits is 2752512, while the sum is 57.

The spelling of 28178888061 in words is "twenty-eight billion, one hundred seventy-eight million, eight hundred eighty-eight thousand, sixty-one".