28777575 has 24 divisors (see below), whose sum is σ = 47796048. Its totient is φ = 15278080.

The previous prime is 28777561. The next prime is 28777591. The reversal of 28777575 is 57577782.

It is not a de Polignac number, because 28777575 - 2⁴ = 28777559 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18529 + ... + 20021.

It is an arithmetic number, because the mean of its divisors is an integer number (1991502).

Almost surely, 2^28777575 is an apocalyptic number.

28777575 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28777575 is a deficient number, since it is larger than the sum of its proper divisors (19018473).

28777575 is a wasteful number, since it uses less digits than its factorization.

28777575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1763 (or 1758 counting only the distinct ones).

The product of its digits is 960400, while the sum is 48.

The square root of 28777575 is about 5364.4734131134. The cubic root of 28777575 is about 306.4441944798. Note that the first 3 decimals are identical.

The spelling of 28777575 in words is "twenty-eight million, seven hundred seventy-seven thousand, five hundred seventy-five".