775840 has 48 divisors (see below), whose sum is σ = 1979208. Its totient is φ = 285696.

The previous prime is 775823. The next prime is 775861. The reversal of 775840 is 48577.

It is a happy number.

775840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 501264 + 274576 = 708^2 + 524^2 .

It is a super-3 number, since 3×775840³ = 1400998773338112000, which contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1894 + ... + 2266.

2⁷⁷⁵⁸⁴⁰ 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 775840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (989604).

775840 is an abundant number, since it is smaller than the sum of its proper divisors (1203368).

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

775840 is a wasteful number, since it uses less digits than its factorization.

775840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401 (or 393 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 31.

The square root of 775840 is about 880.8178018183. The cubic root of 775840 is about 91.8877016700.

The spelling of 775840 in words is "seven hundred seventy-five thousand, eight hundred forty".