775680840 has 128 divisors (see below), whose sum is σ = 2820700800. Its totient is φ = 188040960.

The previous prime is 775680823. The next prime is 775680859. The reversal of 775680840 is 48086577.

775680840 is a `hidden beast` number, since 7 + 7 + 568 + 0 + 84 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

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 31 ways as a sum of consecutive naturals, for example, 20767 + ... + 44526.

It is an arithmetic number, because the mean of its divisors is an integer number (22036725).

Almost surely, 2^775680840 is an apocalyptic number.

It is an amenable number.

775680840 is an abundant number, since it is smaller than the sum of its proper divisors (2045019960).

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

775680840 is a wasteful number, since it uses less digits than its factorization.

775680840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65324 (or 65314 counting only the distinct ones).

The product of its (nonzero) digits is 376320, while the sum is 45.

The square root of 775680840 is about 27851.0473770736. The cubic root of 775680840 is about 918.8141779408.

The spelling of 775680840 in words is "seven hundred seventy-five million, six hundred eighty thousand, eight hundred forty".