780490 has 8 divisors (see below), whose sum is σ = 1404900. Its totient is φ = 312192.

The previous prime is 780469. The next prime is 780499. The reversal of 780490 is 94087.

It can be written as a sum of positive squares in 2 ways, for example, as 744769 + 35721 = 863^2 + 189^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (780499) by changing a digit.

780490 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 3 ways as a sum of consecutive naturals, for example, 39015 + ... + 39034.

2⁷⁸⁰⁴⁹⁰ is an apocalyptic number.

780490 is a deficient number, since it is larger than the sum of its proper divisors (624410).

780490 is a wasteful number, since it uses less digits than its factorization.

780490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78056.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 780490 is about 883.4534509526. The cubic root of 780490 is about 92.0709125611.

The spelling of 780490 in words is "seven hundred eighty thousand, four hundred ninety".