28778264103 has 4 divisors (see below), whose sum is σ = 38371018808. Its totient is φ = 19185509400.

The previous prime is 28778264023. The next prime is 28778264107. The reversal of 28778264103 is 30146287782.

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

It is not a de Polignac number, because 28778264103 - 2¹⁷ = 28778133031 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28778264107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4796377348 + ... + 4796377353.

It is an arithmetic number, because the mean of its divisors is an integer number (9592754702).

Almost surely, 2^28778264103 is an apocalyptic number.

28778264103 is a deficient number, since it is larger than the sum of its proper divisors (9592754705).

28778264103 is an equidigital number, since it uses as much as digits as its factorization.

28778264103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9592754704.

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

The spelling of 28778264103 in words is "twenty-eight billion, seven hundred seventy-eight million, two hundred sixty-four thousand, one hundred three".