780566673 has 4 divisors (see below), whose sum is σ = 1040755568. Its totient is φ = 520377780.

The previous prime is 780566629. The next prime is 780566681. The reversal of 780566673 is 376665087.

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 not a de Polignac number, because 780566673 - 2⁶ = 780566609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (780566603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130094443 + ... + 130094448.

It is an arithmetic number, because the mean of its divisors is an integer number (260188892).

Almost surely, 2^780566673 is an apocalyptic number.

It is an amenable number.

780566673 is a deficient number, since it is larger than the sum of its proper divisors (260188895).

780566673 is a wasteful number, since it uses less digits than its factorization.

780566673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260188894.

The product of its (nonzero) digits is 1270080, while the sum is 48.

The square root of 780566673 is about 27938.6233196985. The cubic root of 780566673 is about 920.7392738597.

The spelling of 780566673 in words is "seven hundred eighty million, five hundred sixty-six thousand, six hundred seventy-three".