28877005 has 4 divisors (see below), whose sum is σ = 34652412. Its totient is φ = 23101600.

The previous prime is 28876963. The next prime is 28877021. The reversal of 28877005 is 50077882.

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 15194404 + 13682601 = 3898^2 + 3699^2 .

It is not a de Polignac number, because 28877005 - 2⁷ = 28876877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2887696 + ... + 2887705.

It is an arithmetic number, because the mean of its divisors is an integer number (8663103).

Almost surely, 2^28877005 is an apocalyptic number.

It is an amenable number.

28877005 is a deficient number, since it is larger than the sum of its proper divisors (5775407).

28877005 is an equidigital number, since it uses as much as digits as its factorization.

28877005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5775406.

The product of its (nonzero) digits is 31360, while the sum is 37.

The square root of 28877005 is about 5373.7328738969. The cubic root of 28877005 is about 306.7967226925.

The spelling of 28877005 in words is "twenty-eight million, eight hundred seventy-seven thousand, five".