775880388 has 18 divisors (see below), whose sum is σ = 1961253294. Its totient is φ = 258626784.

The previous prime is 775880387. The next prime is 775880393. The reversal of 775880388 is 883088577.

It can be written as a sum of positive squares in only one way, i.e., 680583744 + 95296644 = 26088^2 + 9762^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (775880383) 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 5 ways as a sum of consecutive naturals, for example, 10776081 + ... + 10776152.

Almost surely, 2^775880388 is an apocalyptic number.

It is an amenable number.

775880388 is an abundant number, since it is smaller than the sum of its proper divisors (1185372906).

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

775880388 is a wasteful number, since it uses less digits than its factorization.

775880388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21552243 (or 21552238 counting only the distinct ones).

The product of its (nonzero) digits is 3010560, while the sum is 54.

The square root of 775880388 is about 27854.6295613494. The cubic root of 775880388 is about 918.8929611216.

The spelling of 775880388 in words is "seven hundred seventy-five million, eight hundred eighty thousand, three hundred eighty-eight".