780673 has 4 divisors (see below), whose sum is σ = 805888. Its totient is φ = 755460.

The previous prime is 780671. The next prime is 780679. The reversal of 780673 is 376087.

780673 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 376087 = 71 ⋅5297.

It is a cyclic number.

It is not a de Polignac number, because 780673 - 2¹ = 780671 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 25183 = 780673 / (7 + 8 + 0 + 6 + 7 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (780671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12561 + ... + 12622.

It is an arithmetic number, because the mean of its divisors is an integer number (201472).

2⁷⁸⁰⁶⁷³ is an apocalyptic number.

It is an amenable number.

780673 is a deficient number, since it is larger than the sum of its proper divisors (25215).

780673 is a wasteful number, since it uses less digits than its factorization.

780673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25214.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 780673 is about 883.5570157041. The cubic root of 780673 is about 92.0781078958.

The spelling of 780673 in words is "seven hundred eighty thousand, six hundred seventy-three".