780690673 has 4 divisors (see below), whose sum is σ = 892217920. Its totient is φ = 669163428.

The previous prime is 780690667. The next prime is 780690721. The reversal of 780690673 is 376096087.

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: 376096087 = 1489 ⋅252583.

It is a cyclic number.

It is not a de Polignac number, because 780690673 - 2²⁵ = 747136241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (780690623) 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, 55763613 + ... + 55763626.

It is an arithmetic number, because the mean of its divisors is an integer number (223054480).

Almost surely, 2^780690673 is an apocalyptic number.

It is an amenable number.

780690673 is a deficient number, since it is larger than the sum of its proper divisors (111527247).

780690673 is a wasteful number, since it uses less digits than its factorization.

780690673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111527246.

The product of its (nonzero) digits is 381024, while the sum is 46.

The square root of 780690673 is about 27940.8423817178. The cubic root of 780690673 is about 920.7880271688.

The spelling of 780690673 in words is "seven hundred eighty million, six hundred ninety thousand, six hundred seventy-three".