28819985 has 8 divisors (see below), whose sum is σ = 34728936. Its totient is φ = 22959360.

The previous prime is 28819957. The next prime is 28819991. The reversal of 28819985 is 58991882.

It can be written as a sum of positive squares in 4 ways, for example, as 6880129 + 21939856 = 2623^2 + 4684^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28819985 - 2¹² = 28815889 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10754 + ... + 13163.

It is an arithmetic number, because the mean of its divisors is an integer number (4341117).

Almost surely, 2^28819985 is an apocalyptic number.

It is an amenable number.

28819985 is a deficient number, since it is larger than the sum of its proper divisors (5908951).

28819985 is a wasteful number, since it uses less digits than its factorization.

28819985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24163.

The product of its digits is 414720, while the sum is 50.

The square root of 28819985 is about 5368.4248155302. The cubic root of 28819985 is about 306.5946579248.

The spelling of 28819985 in words is "twenty-eight million, eight hundred nineteen thousand, nine hundred eighty-five".