777880889 has 4 divisors (see below), whose sum is σ = 777936756. Its totient is φ = 777825024.

The previous prime is 777880871. The next prime is 777880913. The reversal of 777880889 is 988088777.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 988088777 = 13 ⋅76006829.

It can be written as a sum of positive squares in 2 ways, for example, as 258405625 + 519475264 = 16075^2 + 22792^2 .

It is a cyclic number.

It is not a de Polignac number, because 777880889 - 2¹² = 777876793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (770880889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11657 + ... + 41129.

It is an arithmetic number, because the mean of its divisors is an integer number (194484189).

Almost surely, 2^777880889 is an apocalyptic number.

It is an amenable number.

777880889 is a deficient number, since it is larger than the sum of its proper divisors (55867).

777880889 is a wasteful number, since it uses less digits than its factorization.

777880889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55866.

The product of its (nonzero) digits is 12644352, while the sum is 62.

The square root of 777880889 is about 27890.5161121124. The cubic root of 777880889 is about 919.6820297661.

The spelling of 777880889 in words is "seven hundred seventy-seven million, eight hundred eighty thousand, eight hundred eighty-nine".