28707385 has 32 divisors (see below), whose sum is σ = 42336000. Its totient is φ = 18627840.

The previous prime is 28707379. The next prime is 28707401. The reversal of 28707385 is 58370782.

It is not a de Polignac number, because 28707385 - 2³ = 28707377 is a prime.

It is a super-2 number, since 2×28707385² = 1648227907076450, which contains 22 as substring.

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, 32145 + ... + 33025.

It is an arithmetic number, because the mean of its divisors is an integer number (1323000).

Almost surely, 2^28707385 is an apocalyptic number.

It is an amenable number.

28707385 is a deficient number, since it is larger than the sum of its proper divisors (13628615).

28707385 is an equidigital number, since it uses as much as digits as its factorization.

28707385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 926 (or 912 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 40.

The square root of 28707385 is about 5357.9273044714. The cubic root of 28707385 is about 306.1948472109.

It can be divided in two parts, 28707 and 385, that added together give a palindrome (29092).

The spelling of 28707385 in words is "twenty-eight million, seven hundred seven thousand, three hundred eighty-five".