28870749405 has 20 divisors (see below), whose sum is σ = 51753492252. Its totient is φ = 15397732800.

The previous prime is 28870749377. The next prime is 28870749463. The reversal of 28870749405 is 50494707882.

It is a happy number.

28870749405 is a `hidden beast` number, since 2 + 88 + 70 + 7 + 494 + 0 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 7100927289 + 21769822116 = 84267^2 + 147546^2 .

It is not a de Polignac number, because 28870749405 - 2⁵ = 28870749373 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 35642496 + ... + 35643305.

Almost surely, 2^28870749405 is an apocalyptic number.

It is an amenable number.

28870749405 is a deficient number, since it is larger than the sum of its proper divisors (22882742847).

28870749405 is an equidigital number, since it uses as much as digits as its factorization.

28870749405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71285818 (or 71285809 counting only the distinct ones).

The product of its (nonzero) digits is 4515840, while the sum is 54.

The spelling of 28870749405 in words is "twenty-eight billion, eight hundred seventy million, seven hundred forty-nine thousand, four hundred five".