28009701 has 12 divisors (see below), whose sum is σ = 40509612. Its totient is φ = 18649536.

The previous prime is 28009669. The next prime is 28009721. The reversal of 28009701 is 10790082.

It can be written as a sum of positive squares in 2 ways, for example, as 3744225 + 24265476 = 1935^2 + 4926^2 .

It is not a de Polignac number, because 28009701 - 2⁵ = 28009669 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28009721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8455 + ... + 11291.

It is an arithmetic number, because the mean of its divisors is an integer number (3375801).

Almost surely, 2^28009701 is an apocalyptic number.

It is an amenable number.

28009701 is a deficient number, since it is larger than the sum of its proper divisors (12499911).

28009701 is a wasteful number, since it uses less digits than its factorization.

28009701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3940 (or 3937 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 28009701 is about 5292.4192010838. The cubic root of 28009701 is about 303.6939621259.

Adding to 28009701 its reverse (10790082), we get a palindrome (38799783).

The spelling of 28009701 in words is "twenty-eight million, nine thousand, seven hundred one".