28651207 has 4 divisors (see below), whose sum is σ = 30855160. Its totient is φ = 26447256.

The previous prime is 28651199. The next prime is 28651211. The reversal of 28651207 is 70215682.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28651207 - 2³ = 28651199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28651237) 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, 1101957 + ... + 1101982.

It is an arithmetic number, because the mean of its divisors is an integer number (7713790).

Almost surely, 2^28651207 is an apocalyptic number.

28651207 is a deficient number, since it is larger than the sum of its proper divisors (2203953).

28651207 is a wasteful number, since it uses less digits than its factorization.

28651207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2203952.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 28651207 is about 5352.6822248290. The cubic root of 28651207 is about 305.9949840407.

Adding to 28651207 its reverse (70215682), we get a palindrome (98866889).

The spelling of 28651207 in words is "twenty-eight million, six hundred fifty-one thousand, two hundred seven".