8521576440 has 64 divisors (see below), whose sum is σ = 27531252000. Its totient is φ = 2097618432.

The previous prime is 8521576423. The next prime is 8521576447. The reversal of 8521576440 is 446751258.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 8521576392 and 8521576401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8521576447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2729715 + ... + 2732834.

Almost surely, 2^8521576440 is an apocalyptic number.

It is an amenable number.

8521576440 is an abundant number, since it is smaller than the sum of its proper divisors (19009675560).

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

8521576440 is a wasteful number, since it uses less digits than its factorization.

8521576440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5462576 (or 5462572 counting only the distinct ones).

The product of its (nonzero) digits is 268800, while the sum is 42.

The square root of 8521576440 is about 92312.3850845595. The cubic root of 8521576440 is about 2042.5529073167.

The spelling of 8521576440 in words is "eight billion, five hundred twenty-one million, five hundred seventy-six thousand, four hundred forty".