28430775 has 18 divisors (see below), whose sum is σ = 50923080. Its totient is φ = 15162960.

The previous prime is 28430761. The next prime is 28430777. The reversal of 28430775 is 57703482.

28430775 is a `hidden beast` number, since 284 + 307 + 75 = 666.

It is not a de Polignac number, because 28430775 - 2⁹ = 28430263 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28430777) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 62955 + ... + 63404.

It is an arithmetic number, because the mean of its divisors is an integer number (2829060).

Almost surely, 2^28430775 is an apocalyptic number.

28430775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28430775 is a deficient number, since it is larger than the sum of its proper divisors (22492305).

28430775 is a wasteful number, since it uses less digits than its factorization.

28430775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126375 (or 126367 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 36.

The square root of 28430775 is about 5332.0516689169. The cubic root of 28430775 is about 305.2082247382.

The spelling of 28430775 in words is "twenty-eight million, four hundred thirty thousand, seven hundred seventy-five".