28218701 has 8 divisors (see below), whose sum is σ = 33036864. Its totient is φ = 23597280.

The previous prime is 28218637. The next prime is 28218719. The reversal of 28218701 is 10781282.

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

It is not a de Polignac number, because 28218701 - 2⁶ = 28218637 is a prime.

It is a super-2 number, since 2×28218701² = 1592590172254802, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28218731) 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, 48875 + ... + 49448.

It is an arithmetic number, because the mean of its divisors is an integer number (4129608).

Almost surely, 2^28218701 is an apocalyptic number.

It is an amenable number.

28218701 is a deficient number, since it is larger than the sum of its proper divisors (4818163).

28218701 is an equidigital number, since it uses as much as digits as its factorization.

28218701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98371.

The product of its (nonzero) digits is 1792, while the sum is 29.

The square root of 28218701 is about 5312.1277281331. The cubic root of 28218701 is about 304.4474489208.

Adding to 28218701 its reverse (10781282), we get a palindrome (38999983).

It can be divided in two parts, 2821 and 8701, that multiplied together give a triangular number (24545521 = T₇₀₀₆).

The spelling of 28218701 in words is "twenty-eight million, two hundred eighteen thousand, seven hundred one".