28774317505 has 12 divisors (see below), whose sum is σ = 35722378260. Its totient is φ = 22224101984.

The previous prime is 28774317491. The next prime is 28774317511. The reversal of 28774317505 is 50571347782.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 12700388416 + 16073929089 = 112696^2 + 126783^2 .

It is not a de Polignac number, because 28774317505 - 2¹⁷ = 28774186433 is a prime.

It is a super-2 number, since 2×28774317505² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2035572 + ... + 2049658.

It is an arithmetic number, because the mean of its divisors is an integer number (2976864855).

Almost surely, 2^28774317505 is an apocalyptic number.

It is an amenable number.

28774317505 is a deficient number, since it is larger than the sum of its proper divisors (6948060755).

28774317505 is an frugal number, since it uses more digits than its factorization.

28774317505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28208 (or 14121 counting only the distinct ones).

The product of its (nonzero) digits is 1646400, while the sum is 49.

The spelling of 28774317505 in words is "twenty-eight billion, seven hundred seventy-four million, three hundred seventeen thousand, five hundred five".