28260705 has 32 divisors (see below), whose sum is σ = 50181120. Its totient is φ = 13465280.

The previous prime is 28260697. The next prime is 28260737. The reversal of 28260705 is 50706282.

It is not a de Polignac number, because 28260705 - 2³ = 28260697 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8284 + ... + 11186.

It is an arithmetic number, because the mean of its divisors is an integer number (1568160).

Almost surely, 2^28260705 is an apocalyptic number.

It is an amenable number.

28260705 is a deficient number, since it is larger than the sum of its proper divisors (21920415).

28260705 is a wasteful number, since it uses less digits than its factorization.

28260705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2981.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 28260705 is about 5316.0798526734. The cubic root of 28260705 is about 304.5984323748.

Adding to 28260705 its reverse (50706282), we get a palindrome (78966987).

The spelling of 28260705 in words is "twenty-eight million, two hundred sixty thousand, seven hundred five".