28213701 has 4 divisors (see below), whose sum is σ = 37618272. Its totient is φ = 18809132.

The previous prime is 28213687. The next prime is 28213733. The reversal of 28213701 is 10731282.

28213701 is nontrivially palindromic in base 12.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28213701 - 2⁹ = 28213189 is a prime.

It is a super-3 number, since 3×28213701³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28215701) 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, 4702281 + ... + 4702286.

It is an arithmetic number, because the mean of its divisors is an integer number (9404568).

Almost surely, 2^28213701 is an apocalyptic number.

It is an amenable number.

28213701 is a deficient number, since it is larger than the sum of its proper divisors (9404571).

28213701 is an equidigital number, since it uses as much as digits as its factorization.

28213701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9404570.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 28213701 is about 5311.6570860702. The cubic root of 28213701 is about 304.4294664352.

Adding to 28213701 its reverse (10731282), we get a palindrome (38944983).

The spelling of 28213701 in words is "twenty-eight million, two hundred thirteen thousand, seven hundred one".