775399680 has 432 divisors, whose sum is σ = 3041962560. Its totient is φ = 180633600.

The previous prime is 775399679. The next prime is 775399687. The reversal of 775399680 is 86993577.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (775399687) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 3674775 + ... + 3674985.

It is an arithmetic number, because the mean of its divisors is an integer number (7041580).

Almost surely, 2^775399680 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 775399680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1520981280).

775399680 is an abundant number, since it is smaller than the sum of its proper divisors (2266562880).

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

775399680 is a wasteful number, since it uses less digits than its factorization.

775399680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278 (or 261 counting only the distinct ones).

The product of its (nonzero) digits is 2857680, while the sum is 54.

The square root of 775399680 is about 27845.9993535876. Note that the first 3 decimals coincide. The cubic root of 775399680 is about 918.7031507417.

The spelling of 775399680 in words is "seven hundred seventy-five million, three hundred ninety-nine thousand, six hundred eighty".