782680819 has 4 divisors (see below), whose sum is σ = 783898696. Its totient is φ = 781462944.

The previous prime is 782680781. The next prime is 782680861. The reversal of 782680819 is 918086287.

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 782680819 - 2²⁵ = 749126387 is a prime.

It is a super-2 number, since 2×782680819² = 1225178528861021522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (782620819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 607974 + ... + 609259.

It is an arithmetic number, because the mean of its divisors is an integer number (195974674).

Almost surely, 2^782680819 is an apocalyptic number.

782680819 is a deficient number, since it is larger than the sum of its proper divisors (1217877).

782680819 is a wasteful number, since it uses less digits than its factorization.

782680819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1217876.

The product of its (nonzero) digits is 387072, while the sum is 49.

The square root of 782680819 is about 27976.4332787437. The cubic root of 782680819 is about 921.5697912008.

The spelling of 782680819 in words is "seven hundred eighty-two million, six hundred eighty thousand, eight hundred nineteen".