771988349 has 24 divisors (see below), whose sum is σ = 864154200. Its totient is φ = 689040000.

The previous prime is 771988333. The next prime is 771988351. The reversal of 771988349 is 943889177.

It can be written as a sum of positive squares in 4 ways, for example, as 156700324 + 615288025 = 12518^2 + 24805^2 .

It is not a de Polignac number, because 771988349 - 2⁴ = 771988333 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 771988294 and 771988303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (771988849) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 2211827 + ... + 2212175.

It is an arithmetic number, because the mean of its divisors is an integer number (36006425).

Almost surely, 2^771988349 is an apocalyptic number.

It is an amenable number.

771988349 is a deficient number, since it is larger than the sum of its proper divisors (92165851).

771988349 is a wasteful number, since it uses less digits than its factorization.

771988349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653 (or 642 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 56.

The square root of 771988349 is about 27784.6783137757. The cubic root of 771988349 is about 917.3539077457.

The spelling of 771988349 in words is "seven hundred seventy-one million, nine hundred eighty-eight thousand, three hundred forty-nine".