780640543 has 4 divisors (see below), whose sum is σ = 805822528. Its totient is φ = 755458560.

The previous prime is 780640537. The next prime is 780640547. The reversal of 780640543 is 345046087.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-780640543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (780640547) 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, 12590946 + ... + 12591007.

It is an arithmetic number, because the mean of its divisors is an integer number (201455632).

Almost surely, 2^780640543 is an apocalyptic number.

780640543 is a deficient number, since it is larger than the sum of its proper divisors (25181985).

780640543 is a wasteful number, since it uses less digits than its factorization.

780640543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25181984.

The product of its (nonzero) digits is 80640, while the sum is 37.

The square root of 780640543 is about 27939.9452934325. The cubic root of 780640543 is about 920.7683180858.

The spelling of 780640543 in words is "seven hundred eighty million, six hundred forty thousand, five hundred forty-three".