28775775 has 48 divisors (see below), whose sum is σ = 55353600. Its totient is φ = 12917760.

The previous prime is 28775759. The next prime is 28775777. The reversal of 28775775 is 57757782.

It is not a de Polignac number, because 28775775 - 2⁴ = 28775759 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28775777) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 30511 + ... + 31439.

It is an arithmetic number, because the mean of its divisors is an integer number (1153200).

Almost surely, 2^28775775 is an apocalyptic number.

28775775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28775775 is a deficient number, since it is larger than the sum of its proper divisors (26577825).

28775775 is a wasteful number, since it uses less digits than its factorization.

28775775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1008 (or 1003 counting only the distinct ones).

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

The square root of 28775775 is about 5364.3056400619. The cubic root of 28775775 is about 306.4378051176.

The spelling of 28775775 in words is "twenty-eight million, seven hundred seventy-five thousand, seven hundred seventy-five".