780055 has 4 divisors (see below), whose sum is σ = 936072. Its totient is φ = 624040.

The previous prime is 780049. The next prime is 780061. The reversal of 780055 is 550087.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (780049) and next prime (780061).

It is not a de Polignac number, because 780055 - 2³ = 780047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 78001 + ... + 78010.

It is an arithmetic number, because the mean of its divisors is an integer number (234018).

2⁷⁸⁰⁰⁵⁵ is an apocalyptic number.

780055 is a deficient number, since it is larger than the sum of its proper divisors (156017).

780055 is a wasteful number, since it uses less digits than its factorization.

780055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156016.

The product of its (nonzero) digits is 1400, while the sum is 25.

The square root of 780055 is about 883.2072237023. The cubic root of 780055 is about 92.0538043812.

The spelling of 780055 in words is "seven hundred eighty thousand, fifty-five".