7985611540 has 12 divisors (see below), whose sum is σ = 16769784276. Its totient is φ = 3194244608.

The previous prime is 7985611507. The next prime is 7985611541. The reversal of 7985611540 is 451165897.

It can be written as a sum of positive squares in 2 ways, for example, as 6085872144 + 1899739396 = 78012^2 + 43586^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7985611541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 199640269 + ... + 199640308.

It is an arithmetic number, because the mean of its divisors is an integer number (1397482023).

Almost surely, 2^7985611540 is an apocalyptic number.

It is an amenable number.

7985611540 is an abundant number, since it is smaller than the sum of its proper divisors (8784172736).

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

7985611540 is a wasteful number, since it uses less digits than its factorization.

7985611540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399280586 (or 399280584 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 46.

The square root of 7985611540 is about 89362.2489645376. The cubic root of 7985611540 is about 1998.8002421011.

The spelling of 7985611540 in words is "seven billion, nine hundred eighty-five million, six hundred eleven thousand, five hundred forty".