771371648 has 16 divisors (see below), whose sum is σ = 1536717210. Its totient is φ = 385685760.

The previous prime is 771371647. The next prime is 771371683. The reversal of 771371648 is 846173177.

It can be written as a sum of positive squares in only one way, i.e., 406103104 + 365268544 = 20152^2 + 19112^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a junction number, because it is equal to n+sod(n) for n = 771371599 and 771371608.

It is not an unprimeable number, because it can be changed into a prime (771371647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3013043 + ... + 3013298.

Almost surely, 2^771371648 is an apocalyptic number.

It is an amenable number.

771371648 is a deficient number, since it is larger than the sum of its proper divisors (765345562).

771371648 is an equidigital number, since it uses as much as digits as its factorization.

771371648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6026355 (or 6026343 counting only the distinct ones).

The product of its digits is 197568, while the sum is 44.

The square root of 771371648 is about 27773.5782354381. The cubic root of 771371648 is about 917.1095673638.

The spelling of 771371648 in words is "seven hundred seventy-one million, three hundred seventy-one thousand, six hundred forty-eight".