7828864889 has 4 divisors (see below), whose sum is σ = 7854038400. Its totient is φ = 7803691380.

The previous prime is 7828864819. The next prime is 7828864909. The reversal of 7828864889 is 9884688287.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9884688287 = 67 ⋅147532661.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7828864889 is a prime.

It is a super-2 number, since 2×7828864889² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7828864819) 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, 12586289 + ... + 12586910.

It is an arithmetic number, because the mean of its divisors is an integer number (1963509600).

Almost surely, 2^7828864889 is an apocalyptic number.

It is an amenable number.

7828864889 is a deficient number, since it is larger than the sum of its proper divisors (25173511).

7828864889 is a wasteful number, since it uses less digits than its factorization.

7828864889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25173510.

The product of its digits is 99090432, while the sum is 68.

The square root of 7828864889 is about 88480.8730121940. The cubic root of 7828864889 is about 1985.6358229382.

The spelling of 7828864889 in words is "seven billion, eight hundred twenty-eight million, eight hundred sixty-four thousand, eight hundred eighty-nine".