28781010105 has 32 divisors (see below), whose sum is σ = 46862834304. Its totient is φ = 15080034816.

The previous prime is 28781010079. The next prime is 28781010119. The reversal of 28781010105 is 50101018782.

It is not a de Polignac number, because 28781010105 - 2⁵ = 28781010073 is a prime.

It is a super-2 number, since 2×28781010105² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 336477 + ... + 413253.

It is an arithmetic number, because the mean of its divisors is an integer number (1464463572).

Almost surely, 2^28781010105 is an apocalyptic number.

It is an amenable number.

28781010105 is a deficient number, since it is larger than the sum of its proper divisors (18081824199).

28781010105 is a wasteful number, since it uses less digits than its factorization.

28781010105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77225.

The product of its (nonzero) digits is 4480, while the sum is 33.

Adding to 28781010105 its reverse (50101018782), we get a palindrome (78882028887).

The spelling of 28781010105 in words is "twenty-eight billion, seven hundred eighty-one million, ten thousand, one hundred five".