7771220487 has 8 divisors (see below), whose sum is σ = 11512919280. Its totient is φ = 5180813640.

The previous prime is 7771220467. The next prime is 7771220491. The reversal of 7771220487 is 7840221777.

It is not a de Polignac number, because 7771220487 - 2⁸ = 7771220231 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7771220407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143911464 + ... + 143911517.

It is an arithmetic number, because the mean of its divisors is an integer number (1439114910).

Almost surely, 2^7771220487 is an apocalyptic number.

7771220487 is a deficient number, since it is larger than the sum of its proper divisors (3741698793).

7771220487 is a wasteful number, since it uses less digits than its factorization.

7771220487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287822990 (or 287822984 counting only the distinct ones).

The product of its (nonzero) digits is 307328, while the sum is 45.

The square root of 7771220487 is about 88154.5261855567. The cubic root of 7771220487 is about 1980.7503606871.

The spelling of 7771220487 in words is "seven billion, seven hundred seventy-one million, two hundred twenty thousand, four hundred eighty-seven".