780642 has 24 divisors (see below), whose sum is σ = 1747200. Its totient is φ = 251640.

The previous prime is 780631. The next prime is 780649. The reversal of 780642 is 246087.

It is not an unprimeable number, because it can be changed into a prime (780649) by changing a digit.

780642 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 11 ways as a sum of consecutive naturals, for example, 142 + ... + 1257.

It is an arithmetic number, because the mean of its divisors is an integer number (72800).

2⁷⁸⁰⁶⁴² is an apocalyptic number.

780642 is an abundant number, since it is smaller than the sum of its proper divisors (966558).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

780642 is a wasteful number, since it uses less digits than its factorization.

780642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1438 (or 1435 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 780642 is about 883.5394728024. The cubic root of 780642 is about 92.0768890931.

The spelling of 780642 in words is "seven hundred eighty thousand, six hundred forty-two".