28136207 has 16 divisors (see below), whose sum is σ = 34214400. Its totient is φ = 22803840.

The previous prime is 28136203. The next prime is 28136219. The reversal of 28136207 is 70263182.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 28136207 - 2² = 28136203 is a prime.

It is a super-2 number, since 2×28136207² = 1583292288693698, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28136207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28136203) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 407 + ... + 7512.

It is an arithmetic number, because the mean of its divisors is an integer number (2138400).

Almost surely, 2^28136207 is an apocalyptic number.

28136207 is a deficient number, since it is larger than the sum of its proper divisors (6078193).

28136207 is a wasteful number, since it uses less digits than its factorization.

28136207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7966.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 28136207 is about 5304.3573597562. The cubic root of 28136207 is about 304.1504874445.

Adding to 28136207 its reverse (70263182), we get a palindrome (98399389).

The spelling of 28136207 in words is "twenty-eight million, one hundred thirty-six thousand, two hundred seven".