28495405 has 4 divisors (see below), whose sum is σ = 34194492. Its totient is φ = 22796320.

The previous prime is 28495403. The next prime is 28495427. The reversal of 28495405 is 50459482.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21557449 + 6937956 = 4643^2 + 2634^2 .

It is not a de Polignac number, because 28495405 - 2¹ = 28495403 is a prime.

It is a super-2 number, since 2×28495405² = 1623976212228050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28495403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2849536 + ... + 2849545.

It is an arithmetic number, because the mean of its divisors is an integer number (8548623).

Almost surely, 2^28495405 is an apocalyptic number.

It is an amenable number.

28495405 is a deficient number, since it is larger than the sum of its proper divisors (5699087).

28495405 is an equidigital number, since it uses as much as digits as its factorization.

28495405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5699086.

The product of its (nonzero) digits is 57600, while the sum is 37.

The square root of 28495405 is about 5338.1087474873. The cubic root of 28495405 is about 305.4393203191.

It can be divided in two parts, 28495 and 405, that added together give a square (28900 = 170²).

The spelling of 28495405 in words is "twenty-eight million, four hundred ninety-five thousand, four hundred five".