782876348809 has 3 divisors (see below), whose sum is σ = 782877233613. Its totient is φ = 782875464006.

The previous prime is 782876348747. The next prime is 782876348819. The reversal of 782876348809 is 908843678287.

The square root of 782876348809 is 884803.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 908843678287 = 1543 ⋅589010809.

It is not a de Polignac number, because 782876348809 - 2¹⁷ = 782876217737 is a prime.

It is a super-2 number, since 2×782876348809² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (782876348819) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 442402 + ... + 1327204.

It is an arithmetic number, because the mean of its divisors is an integer number (260959077871).

Almost surely, 2^782876348809 is an apocalyptic number.

782876348809 is the 884803-rd square number.

782876348809 is the 442402-nd centered octagonal number.

It is an amenable number.

782876348809 is a deficient number, since it is larger than the sum of its proper divisors (884804).

782876348809 is an frugal number, since it uses more digits than its factorization.

782876348809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1769606 (or 884803 counting only the distinct ones).

The product of its (nonzero) digits is 260112384, while the sum is 70.

The spelling of 782876348809 in words is "seven hundred eighty-two billion, eight hundred seventy-six million, three hundred forty-eight thousand, eight hundred nine".