28770005 has 16 divisors (see below), whose sum is σ = 38016000. Its totient is φ = 20727360.

The previous prime is 28769999. The next prime is 28770011. The reversal of 28770005 is 50007782.

It is an interprime number because it is at equal distance from previous prime (28769999) and next prime (28770011).

It is a de Polignac number, because none of the positive numbers 2^k-28770005 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28770005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3596 + ... + 8394.

It is an arithmetic number, because the mean of its divisors is an integer number (2376000).

Almost surely, 2^28770005 is an apocalyptic number.

It is an amenable number.

28770005 is a deficient number, since it is larger than the sum of its proper divisors (9245995).

28770005 is a wasteful number, since it uses less digits than its factorization.

28770005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4924.

The product of its (nonzero) digits is 3920, while the sum is 29.

The square root of 28770005 is about 5363.7677988518. The cubic root of 28770005 is about 306.4173218659.

Adding to 28770005 its reverse (50007782), we get a palindrome (78777787).

The spelling of 28770005 in words is "twenty-eight million, seven hundred seventy thousand, five".