8013781504 has 40 divisors (see below), whose sum is σ = 16953806628. Its totient is φ = 3771187200.

The previous prime is 8013781459. The next prime is 8013781507. The reversal of 8013781504 is 4051873108.

It can be written as a sum of positive squares in 2 ways, for example, as 7729926400 + 283855104 = 87920^2 + 16848^2 .

It is not an unprimeable number, because it can be changed into a prime (8013781507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 451647 + ... + 469054.

Almost surely, 2^8013781504 is an apocalyptic number.

It is an amenable number.

8013781504 is an abundant number, since it is smaller than the sum of its proper divisors (8940025124).

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

8013781504 is an equidigital number, since it uses as much as digits as its factorization.

8013781504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 920736 (or 920720 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 8013781504 is about 89519.7268986004. The cubic root of 8013781504 is about 2001.1477998184.

The spelling of 8013781504 in words is "eight billion, thirteen million, seven hundred eighty-one thousand, five hundred four".