785136887 has 4 divisors (see below), whose sum is σ = 796855416. Its totient is φ = 773418360.

The previous prime is 785136853. The next prime is 785136893. The reversal of 785136887 is 788631587.

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

It is a cyclic number.

It is not a de Polignac number, because 785136887 - 2²⁰ = 784088311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (785136787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5859164 + ... + 5859297.

It is an arithmetic number, because the mean of its divisors is an integer number (199213854).

Almost surely, 2^785136887 is an apocalyptic number.

785136887 is a deficient number, since it is larger than the sum of its proper divisors (11718529).

785136887 is a wasteful number, since it uses less digits than its factorization.

785136887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11718528.

The product of its digits is 2257920, while the sum is 53.

The square root of 785136887 is about 28020.2941990265. The cubic root of 785136887 is about 922.5327527583.

The spelling of 785136887 in words is "seven hundred eighty-five million, one hundred thirty-six thousand, eight hundred eighty-seven".