28630287 has 16 divisors (see below), whose sum is σ = 48474880. Its totient is φ = 16360056.

The previous prime is 28630271. The next prime is 28630297. The reversal of 28630287 is 78203682.

It is a happy number.

It is not a de Polignac number, because 28630287 - 2⁴ = 28630271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28630237) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75553 + ... + 75930.

It is an arithmetic number, because the mean of its divisors is an integer number (3029680).

Almost surely, 2^28630287 is an apocalyptic number.

28630287 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

28630287 is a deficient number, since it is larger than the sum of its proper divisors (19844593).

28630287 is a wasteful number, since it uses less digits than its factorization.

28630287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151499 (or 151493 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 28630287 is about 5350.7277075179. The cubic root of 28630287 is about 305.9204906843.

The spelling of 28630287 in words is "twenty-eight million, six hundred thirty thousand, two hundred eighty-seven".