28052730 has 80 divisors (see below), whose sum is σ = 76839840. Its totient is φ = 7341408.

The previous prime is 28052681. The next prime is 28052747. The reversal of 28052730 is 3725082.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 28052694 and 28052703.

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 47497 + ... + 48083.

It is an arithmetic number, because the mean of its divisors is an integer number (960498).

Almost surely, 2^28052730 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28052730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38419920).

28052730 is an abundant number, since it is smaller than the sum of its proper divisors (48787110).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28052730 is a wasteful number, since it uses less digits than its factorization.

28052730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665 (or 656 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 28052730 is about 5296.4827952142. The cubic root of 28052730 is about 303.8493959120.

It can be divided in two parts, 28052 and 730, that added together give a palindrome (28782).

The spelling of 28052730 in words is "twenty-eight million, fifty-two thousand, seven hundred thirty".