7128869 has 4 divisors (see below), whose sum is σ = 7776960. Its totient is φ = 6480780.

The previous prime is 7128833. The next prime is 7128907. The reversal of 7128869 is 9688217.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 7128869 - 2¹⁶ = 7063333 is a prime.

It is a super-2 number, since 2×7128869² = 101641546438322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7128269) 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, 324029 + ... + 324050.

It is an arithmetic number, because the mean of its divisors is an integer number (1944240).

Almost surely, 2^7128869 is an apocalyptic number.

It is an amenable number.

7128869 is a deficient number, since it is larger than the sum of its proper divisors (648091).

7128869 is a wasteful number, since it uses less digits than its factorization.

7128869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648090.

The product of its digits is 48384, while the sum is 41.

The square root of 7128869 is about 2669.9941947502. The cubic root of 7128869 is about 192.4598803218.

It can be divided in two parts, 7128 and 869, that added together give a palindrome (7997).

The spelling of 7128869 in words is "seven million, one hundred twenty-eight thousand, eight hundred sixty-nine".