28838430405 has 20 divisors (see below), whose sum is σ = 51695557452. Its totient is φ = 15380496000.

The previous prime is 28838430373. The next prime is 28838430407. The reversal of 28838430405 is 50403483882.

It can be written as a sum of positive squares in 2 ways, for example, as 11368464129 + 17469966276 = 106623^2 + 132174^2 .

It is not a de Polignac number, because 28838430405 - 2⁵ = 28838430373 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28838430407) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 35602596 + ... + 35603405.

Almost surely, 2^28838430405 is an apocalyptic number.

It is an amenable number.

28838430405 is a deficient number, since it is larger than the sum of its proper divisors (22857127047).

28838430405 is an equidigital number, since it uses as much as digits as its factorization.

28838430405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71206018 (or 71206009 counting only the distinct ones).

The product of its (nonzero) digits is 737280, while the sum is 45.

The spelling of 28838430405 in words is "twenty-eight billion, eight hundred thirty-eight million, four hundred thirty thousand, four hundred five".