28746405 has 48 divisors (see below), whose sum is σ = 53829360. Its totient is φ = 14137344.

The previous prime is 28746397. The next prime is 28746413. The reversal of 28746405 is 50464782.

28746405 is a `hidden beast` number, since 2 + 8 + 7 + 4 + 640 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (28746397) and next prime (28746413).

It can be written as a sum of positive squares in 8 ways, for example, as 6084 + 28740321 = 78^2 + 5361^2 .

It is not a de Polignac number, because 28746405 - 2³ = 28746397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28746405.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 40191 + ... + 40899.

It is an arithmetic number, because the mean of its divisors is an integer number (1121445).

Almost surely, 2^28746405 is an apocalyptic number.

It is an amenable number.

28746405 is a deficient number, since it is larger than the sum of its proper divisors (25082955).

28746405 is a wasteful number, since it uses less digits than its factorization.

28746405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 790 (or 787 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 36.

The square root of 28746405 is about 5361.5674014228. The cubic root of 28746405 is about 306.3335143609. Note that the first 3 decimals are identical.

The spelling of 28746405 in words is "twenty-eight million, seven hundred forty-six thousand, four hundred five".