7881561904 has 10 divisors (see below), whose sum is σ = 15270526220. Its totient is φ = 3940780944.

The previous prime is 7881561901. The next prime is 7881561907. The reversal of 7881561904 is 4091651887.

It is an interprime number because it is at equal distance from previous prime (7881561901) and next prime (7881561907).

It is not an unprimeable number, because it can be changed into a prime (7881561901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 246298794 + ... + 246298825.

It is an arithmetic number, because the mean of its divisors is an integer number (1527052622).

Almost surely, 2^7881561904 is an apocalyptic number.

It is an amenable number.

7881561904 is a deficient number, since it is larger than the sum of its proper divisors (7388964316).

7881561904 is a wasteful number, since it uses less digits than its factorization.

7881561904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492597627 (or 492597621 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 49.

The square root of 7881561904 is about 88778.1611884364. The cubic root of 7881561904 is about 1990.0810471777.

The spelling of 7881561904 in words is "seven billion, eight hundred eighty-one million, five hundred sixty-one thousand, nine hundred four".