28780275 has 24 divisors (see below), whose sum is σ = 47947824. Its totient is φ = 15232000.

The previous prime is 28780261. The next prime is 28780289. The reversal of 28780275 is 57208782.

It is an interprime number because it is at equal distance from previous prime (28780261) and next prime (28780289).

It is not a de Polignac number, because 28780275 - 2²⁰ = 27731699 is a prime.

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, 8875 + ... + 11675.

It is an arithmetic number, because the mean of its divisors is an integer number (1997826).

Almost surely, 2^28780275 is an apocalyptic number.

28780275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28780275 is a deficient number, since it is larger than the sum of its proper divisors (19167549).

28780275 is a wasteful number, since it uses less digits than its factorization.

28780275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2951 (or 2946 counting only the distinct ones).

The product of its (nonzero) digits is 62720, while the sum is 39.

The square root of 28780275 is about 5364.7250628527. The cubic root of 28780275 is about 306.4537780236.

The spelling of 28780275 in words is "twenty-eight million, seven hundred eighty thousand, two hundred seventy-five".