28211313407 has 4 divisors (see below), whose sum is σ = 28568418720. Its totient is φ = 27854208096.

The previous prime is 28211313353. The next prime is 28211313409. The reversal of 28211313407 is 70431311282.

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 28211313407 - 2¹⁶ = 28211247871 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 (28211313409) 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, 178552538 + ... + 178552695.

It is an arithmetic number, because the mean of its divisors is an integer number (7142104680).

Almost surely, 2^28211313407 is an apocalyptic number.

28211313407 is a deficient number, since it is larger than the sum of its proper divisors (357105313).

28211313407 is an equidigital number, since it uses as much as digits as its factorization.

28211313407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357105312.

The product of its (nonzero) digits is 8064, while the sum is 32.

Adding to 28211313407 its reverse (70431311282), we get a palindrome (98642624689).

The spelling of 28211313407 in words is "twenty-eight billion, two hundred eleven million, three hundred thirteen thousand, four hundred seven".