779985126 has 80 divisors (see below), whose sum is σ = 1877087520. Its totient is φ = 241194240.

The previous prime is 779985119. The next prime is 779985139. The reversal of 779985126 is 621589977.

It is a Harshad number since it is a multiple of its sum of digits (54).

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 39 ways as a sum of consecutive naturals, for example, 193540 + ... + 197528.

It is an arithmetic number, because the mean of its divisors is an integer number (23463594).

Almost surely, 2^779985126 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 779985126, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (938543760).

779985126 is an abundant number, since it is smaller than the sum of its proper divisors (1097102394).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

779985126 is a wasteful number, since it uses less digits than its factorization.

779985126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4091 (or 4082 counting only the distinct ones).

The product of its digits is 1905120, while the sum is 54.

The square root of 779985126 is about 27928.2137989525. The cubic root of 779985126 is about 920.5105570345.

The spelling of 779985126 in words is "seven hundred seventy-nine million, nine hundred eighty-five thousand, one hundred twenty-six".