780730 has 16 divisors (see below), whose sum is σ = 1421064. Its totient is φ = 308800.

The previous prime is 780721. The next prime is 780733. The reversal of 780730 is 37087.

780730 is nontrivially palindromic in base 8.

It can be written as a sum of positive squares in 4 ways, for example, as 641601 + 139129 = 801^2 + 373^2 .

It is a junction number, because it is equal to n+sod(n) for n = 780695 and 780704.

It is not an unprimeable number, because it can be changed into a prime (780733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 624 + ... + 1396.

2⁷⁸⁰⁷³⁰ is an apocalyptic number.

780730 is a deficient number, since it is larger than the sum of its proper divisors (640334).

780730 is a wasteful number, since it uses less digits than its factorization.

780730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 881.

The product of its (nonzero) digits is 1176, while the sum is 25.

The square root of 780730 is about 883.5892710983. The cubic root of 780730 is about 92.0803488360.

The spelling of 780730 in words is "seven hundred eighty thousand, seven hundred thirty".