28087730 has 48 divisors (see below), whose sum is σ = 56306880. Its totient is φ = 10079520.

The previous prime is 28087693. The next prime is 28087733. The reversal of 28087730 is 3778082.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28087733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 168107 + ... + 168273.

It is an arithmetic number, because the mean of its divisors is an integer number (1173060).

Almost surely, 2^28087730 is an apocalyptic number.

28087730 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

28087730 is a wasteful number, since it uses less digits than its factorization.

28087730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335 (or 324 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 28087730 is about 5299.7858447300. The cubic root of 28087730 is about 303.9757093357.

The spelling of 28087730 in words is "twenty-eight million, eighty-seven thousand, seven hundred thirty".