28778175662 has 4 divisors (see below), whose sum is σ = 43167263496. Its totient is φ = 14389087830.

The previous prime is 28778175661. The next prime is 28778175677. The reversal of 28778175662 is 26657187782.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28778175661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7194543914 + ... + 7194543917.

It is an arithmetic number, because the mean of its divisors is an integer number (10791815874).

Almost surely, 2^28778175662 is an apocalyptic number.

28778175662 is a deficient number, since it is larger than the sum of its proper divisors (14389087834).

28778175662 is a wasteful number, since it uses less digits than its factorization.

28778175662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14389087833.

The product of its digits is 15805440, while the sum is 59.

The spelling of 28778175662 in words is "twenty-eight billion, seven hundred seventy-eight million, one hundred seventy-five thousand, six hundred sixty-two".