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28987404173 = 721345506129
BaseRepresentation
bin11010111111110010…
…001010111110001101
32202211011220201000222
4122333302022332031
5433331233413143
621152220401125
72044222604300
oct327762127615
982734821028
1028987404173
11113256a7882
12574b9a61a5
13296c667980
14158db7cb37
15b49caa768
hex6bfc8af8d

28987404173 has 12 divisors (see below), whose sum is σ = 36313891740. Its totient is φ = 22935088512.

The previous prime is 28987404163. The next prime is 28987404211. The reversal of 28987404173 is 37140478982.

It can be written as a sum of positive squares in 2 ways, for example, as 10633115689 + 18354288484 = 103117^2 + 135478^2 .

It is not a de Polignac number, because 28987404173 - 214 = 28987387789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28987404163) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22752428 + ... + 22753701.

It is an arithmetic number, because the mean of its divisors is an integer number (3026157645).

Almost surely, 228987404173 is an apocalyptic number.

It is an amenable number.

28987404173 is a deficient number, since it is larger than the sum of its proper divisors (7326487567).

28987404173 is a wasteful number, since it uses less digits than its factorization.

28987404173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45506156 (or 45506149 counting only the distinct ones).

The product of its (nonzero) digits is 2709504, while the sum is 53.

The spelling of 28987404173 in words is "twenty-eight billion, nine hundred eighty-seven million, four hundred four thousand, one hundred seventy-three".

Divisors: 1 7 13 49 91 637 45506129 318542903 591579677 2229800321 4141057739 28987404173