28477380069 has 12 divisors (see below), whose sum is σ = 41498012556. Its totient is φ = 18816911232.

The previous prime is 28477380059. The next prime is 28477380091. The reversal of 28477380069 is 96008377482.

It can be written as a sum of positive squares in 2 ways, for example, as 4865062500 + 23612317569 = 69750^2 + 153663^2 .

It is not a de Polignac number, because 28477380069 - 2⁵ = 28477380037 is a prime.

It is a super-2 number, since 2×28477380069² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28477379997 and 28477380024.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28477380059) 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 in 11 ways as a sum of consecutive naturals, for example, 13999662 + ... + 14001695.

It is an arithmetic number, because the mean of its divisors is an integer number (3458167713).

Almost surely, 2^28477380069 is an apocalyptic number.

It is an amenable number.

28477380069 is a deficient number, since it is larger than the sum of its proper divisors (13020632487).

28477380069 is a wasteful number, since it uses less digits than its factorization.

28477380069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28001476 (or 28001473 counting only the distinct ones).

The product of its (nonzero) digits is 4064256, while the sum is 54.

The spelling of 28477380069 in words is "twenty-eight billion, four hundred seventy-seven million, three hundred eighty thousand, sixty-nine".