780000457729 has 4 divisors (see below), whose sum is σ = 782756643376. Its totient is φ = 777244272084.

The previous prime is 780000457667. The next prime is 780000457741. The reversal of 780000457729 is 927754000087.

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 a cyclic number.

It is not a de Polignac number, because 780000457729 - 2³³ = 771410523137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (780000407729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1378092399 + ... + 1378092964.

It is an arithmetic number, because the mean of its divisors is an integer number (195689160844).

Almost surely, 2^780000457729 is an apocalyptic number.

It is an amenable number.

780000457729 is a deficient number, since it is larger than the sum of its proper divisors (2756185647).

780000457729 is a wasteful number, since it uses less digits than its factorization.

780000457729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2756185646.

The product of its (nonzero) digits is 987840, while the sum is 49.

The spelling of 780000457729 in words is "seven hundred eighty billion, four hundred fifty-seven thousand, seven hundred twenty-nine".