7881401856 has 80 divisors (see below), whose sum is σ = 22101710400. Its totient is φ = 2488854528.

The previous prime is 7881401819. The next prime is 7881401893. The reversal of 7881401856 is 6581041887.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (7881401819) and next prime (7881401893).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105846 + ... + 164213.

It is an arithmetic number, because the mean of its divisors is an integer number (276271380).

Almost surely, 2^7881401856 is an apocalyptic number.

7881401856 is a gapful number since it is divisible by the number (76) formed by its first and last digit.

It is an amenable number.

7881401856 is an abundant number, since it is smaller than the sum of its proper divisors (14220308544).

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

7881401856 is a wasteful number, since it uses less digits than its factorization.

7881401856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270099 (or 270083 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 48.

The square root of 7881401856 is about 88777.2597910073. The cubic root of 7881401856 is about 1990.0675764701.

The spelling of 7881401856 in words is "seven billion, eight hundred eighty-one million, four hundred one thousand, eight hundred fifty-six".