7771400648 has 32 divisors (see below), whose sum is σ = 15900788160. Its totient is φ = 3531401280.

The previous prime is 7771400629. The next prime is 7771400687. The reversal of 7771400648 is 8460041777.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 7771400599 and 7771400608.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 335786 + ... + 358182.

It is an arithmetic number, because the mean of its divisors is an integer number (496899630).

Almost surely, 2^7771400648 is an apocalyptic number.

It is an amenable number.

7771400648 is an abundant number, since it is smaller than the sum of its proper divisors (8129387512).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7771400648 is a wasteful number, since it uses less digits than its factorization.

7771400648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26357 (or 26353 counting only the distinct ones).

The product of its (nonzero) digits is 263424, while the sum is 44.

The square root of 7771400648 is about 88155.5480273363. The cubic root of 7771400648 is about 1980.7656672149.

The spelling of 7771400648 in words is "seven billion, seven hundred seventy-one million, four hundred thousand, six hundred forty-eight".