8256772640 has 48 divisors (see below), whose sum is σ = 19582624152. Its totient is φ = 3289841664.

The previous prime is 8256772637. The next prime is 8256772651. The reversal of 8256772640 is 462776528.

It can be written as a sum of positive squares in 4 ways, for example, as 8230844176 + 25928464 = 90724^2 + 5092^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59279 + ... + 141518.

Almost surely, 2^8256772640 is an apocalyptic number.

8256772640 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8256772640 is an abundant number, since it is smaller than the sum of its proper divisors (11325851512).

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

8256772640 is a wasteful number, since it uses less digits than its factorization.

8256772640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201069 (or 201061 counting only the distinct ones).

The product of its (nonzero) digits is 1128960, while the sum is 47.

The square root of 8256772640 is about 90866.7851307616. The cubic root of 8256772640 is about 2021.1727856178.

The spelling of 8256772640 in words is "eight billion, two hundred fifty-six million, seven hundred seventy-two thousand, six hundred forty".