28874457405 has 24 divisors (see below), whose sum is σ = 51774891480. Its totient is φ = 14868685440.

The previous prime is 28874457401. The next prime is 28874457461. The reversal of 28874457405 is 50475447882.

28874457405 is a `hidden beast` number, since 2 + 88 + 74 + 457 + 40 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 4964329764 + 23910127641 = 70458^2 + 154629^2 .

It is not a de Polignac number, because 28874457405 - 2² = 28874457401 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28874457401) 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 23 ways as a sum of consecutive naturals, for example, 11061706 + ... + 11064315.

It is an arithmetic number, because the mean of its divisors is an integer number (2157287145).

Almost surely, 2^28874457405 is an apocalyptic number.

It is an amenable number.

28874457405 is a deficient number, since it is larger than the sum of its proper divisors (22900434075).

28874457405 is a wasteful number, since it uses less digits than its factorization.

28874457405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22126061 (or 22126058 counting only the distinct ones).

The product of its (nonzero) digits is 10035200, while the sum is 54.

The spelling of 28874457405 in words is "twenty-eight billion, eight hundred seventy-four million, four hundred fifty-seven thousand, four hundred five".