780745 has 8 divisors (see below), whose sum is σ = 1070784. Its totient is φ = 535344.

The previous prime is 780733. The next prime is 780799. The reversal of 780745 is 547087.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 780745 - 2⁹ = 780233 is a prime.

It is a Duffinian number.

780745 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11119 + ... + 11188.

It is an arithmetic number, because the mean of its divisors is an integer number (133848).

2⁷⁸⁰⁷⁴⁵ is an apocalyptic number.

It is an amenable number.

780745 is a deficient number, since it is larger than the sum of its proper divisors (290039).

780745 is a wasteful number, since it uses less digits than its factorization.

780745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22319.

The product of its (nonzero) digits is 7840, while the sum is 31.

The square root of 780745 is about 883.5977591642. The cubic root of 780745 is about 92.0809385389.

The spelling of 780745 in words is "seven hundred eighty thousand, seven hundred forty-five".