785578055 has 4 divisors (see below), whose sum is σ = 942693672. Its totient is φ = 628462440.

The previous prime is 785578021. The next prime is 785578063. The reversal of 785578055 is 550875587.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 550875587 = 53 ⋅10393879.

It is not a de Polignac number, because 785578055 - 2⁸ = 785577799 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 785577994 and 785578012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78557801 + ... + 78557810.

It is an arithmetic number, because the mean of its divisors is an integer number (235673418).

Almost surely, 2^785578055 is an apocalyptic number.

785578055 is a deficient number, since it is larger than the sum of its proper divisors (157115617).

785578055 is a wasteful number, since it uses less digits than its factorization.

785578055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157115616.

The product of its (nonzero) digits is 1960000, while the sum is 50.

The square root of 785578055 is about 28028.1653876953. The cubic root of 785578055 is about 922.7055106262.

The spelling of 785578055 in words is "seven hundred eighty-five million, five hundred seventy-eight thousand, fifty-five".