28213107 has 8 divisors (see below), whose sum is σ = 40511184. Its totient is φ = 17361888.

The previous prime is 28213103. The next prime is 28213109. The reversal of 28213107 is 70131282.

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

It is not a de Polignac number, because 28213107 - 2² = 28213103 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28213103) 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, 361668 + ... + 361745.

It is an arithmetic number, because the mean of its divisors is an integer number (5063898).

Almost surely, 2^28213107 is an apocalyptic number.

28213107 is a deficient number, since it is larger than the sum of its proper divisors (12298077).

28213107 is a wasteful number, since it uses less digits than its factorization.

28213107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 723429.

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

The square root of 28213107 is about 5311.6011710218. The cubic root of 28213107 is about 304.4273299747.

Adding to 28213107 its reverse (70131282), we get a palindrome (98344389).

The spelling of 28213107 in words is "twenty-eight million, two hundred thirteen thousand, one hundred seven".