28873685 has 8 divisors (see below), whose sum is σ = 34768440. Its totient is φ = 23018944.

The previous prime is 28873627. The next prime is 28873687. The reversal of 28873685 is 58637882.

It can be written as a sum of positive squares in 4 ways, for example, as 9284209 + 19589476 = 3047^2 + 4426^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 28873685 - 2²² = 24679381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28873687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8390 + ... + 11319.

It is an arithmetic number, because the mean of its divisors is an integer number (4346055).

Almost surely, 2^28873685 is an apocalyptic number.

It is an amenable number.

28873685 is a deficient number, since it is larger than the sum of its proper divisors (5894755).

28873685 is a wasteful number, since it uses less digits than its factorization.

28873685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20007.

The product of its digits is 645120, while the sum is 47.

The square root of 28873685 is about 5373.4239549844. The cubic root of 28873685 is about 306.7849647308.

The spelling of 28873685 in words is "twenty-eight million, eight hundred seventy-three thousand, six hundred eighty-five".