7881606478 has 4 divisors (see below), whose sum is σ = 11822409720. Its totient is φ = 3940803238.

The previous prime is 7881606451. The next prime is 7881606493. The reversal of 7881606478 is 8746061887.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 1970401618 + ... + 1970401621.

It is an arithmetic number, because the mean of its divisors is an integer number (2955602430).

Almost surely, 2^7881606478 is an apocalyptic number.

7881606478 is a deficient number, since it is larger than the sum of its proper divisors (3940803242).

7881606478 is a wasteful number, since it uses less digits than its factorization.

7881606478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3940803241.

The product of its (nonzero) digits is 3612672, while the sum is 55.

The square root of 7881606478 is about 88778.4122295505. The cubic root of 7881606478 is about 1990.0847987904.

The spelling of 7881606478 in words is "seven billion, eight hundred eighty-one million, six hundred six thousand, four hundred seventy-eight".