28703869 has 4 divisors (see below), whose sum is σ = 28806300. Its totient is φ = 28601440.

The previous prime is 28703849. The next prime is 28703879. The reversal of 28703869 is 96830782.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9998244 + 18705625 = 3162^2 + 4325^2 .

It is a cyclic number.

It is not a de Polignac number, because 28703869 - 2¹⁵ = 28671101 is a prime.

It is a super-3 number, since 3×28703869³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28703849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50794 + ... + 51355.

It is an arithmetic number, because the mean of its divisors is an integer number (7201575).

Almost surely, 2^28703869 is an apocalyptic number.

It is an amenable number.

28703869 is a deficient number, since it is larger than the sum of its proper divisors (102431).

28703869 is a wasteful number, since it uses less digits than its factorization.

28703869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102430.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 28703869 is about 5357.5991824697. The cubic root of 28703869 is about 306.1823460719.

The spelling of 28703869 in words is "twenty-eight million, seven hundred three thousand, eight hundred sixty-nine".