8263250640 has 100 divisors (see below), whose sum is σ = 28699516164. Its totient is φ = 2203531776.

The previous prime is 8263250629. The next prime is 8263250669. The reversal of 8263250640 is 460523628.

8263250640 is a `hidden beast` number, since 8 + 2 + 6 + 3 + 2 + 5 + 0 + 640 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 6289758864 + 1973491776 = 79308^2 + 44424^2 .

It is a super-2 number, since 2×8263250640² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 8263250595 and 8263250604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 631117 + ... + 644076.

Almost surely, 2^8263250640 is an apocalyptic number.

8263250640 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8263250640 is an abundant number, since it is smaller than the sum of its proper divisors (20436265524).

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

8263250640 is a wasteful number, since it uses less digits than its factorization.

8263250640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1275218 (or 1275203 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 8263250640 is about 90902.4237300634. The cubic root of 8263250640 is about 2021.7012299713.

The spelling of 8263250640 in words is "eight billion, two hundred sixty-three million, two hundred fifty thousand, six hundred forty".