780013643 has 8 divisors (see below), whose sum is σ = 799438416. Its totient is φ = 760608000.

The previous prime is 780013583. The next prime is 780013691. The reversal of 780013643 is 346310087.

780013643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-780013643 is a prime.

It is a super-2 number, since 2×780013643² = 1216842566532262898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (780013043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113555 + ... + 120227.

It is an arithmetic number, because the mean of its divisors is an integer number (99929802).

Almost surely, 2^780013643 is an apocalyptic number.

780013643 is a deficient number, since it is larger than the sum of its proper divisors (19424773).

780013643 is a wasteful number, since it uses less digits than its factorization.

780013643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9565.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 780013643 is about 27928.7243353505. The cubic root of 780013643 is about 920.5217751457.

The spelling of 780013643 in words is "seven hundred eighty million, thirteen thousand, six hundred forty-three".