771816868 has 6 divisors (see below), whose sum is σ = 1350679526. Its totient is φ = 385908432.

The previous prime is 771816853. The next prime is 771816869. The reversal of 771816868 is 868618177.

It can be written as a sum of positive squares in only one way, i.e., 712249344 + 59567524 = 26688^2 + 7718^2 .

It is not an unprimeable number, because it can be changed into a prime (771816869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 96477105 + ... + 96477112.

Almost surely, 2^771816868 is an apocalyptic number.

It is an amenable number.

771816868 is a deficient number, since it is larger than the sum of its proper divisors (578862658).

771816868 is a wasteful number, since it uses less digits than its factorization.

771816868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192954221 (or 192954219 counting only the distinct ones).

The product of its digits is 903168, while the sum is 52.

The square root of 771816868 is about 27781.5922509852. The cubic root of 771816868 is about 917.2859790804.

The spelling of 771816868 in words is "seven hundred seventy-one million, eight hundred sixteen thousand, eight hundred sixty-eight".