7902947856 has 80 divisors (see below), whose sum is σ = 21511837440. Its totient is φ = 2493187200.

The previous prime is 7902947791. The next prime is 7902947861. The reversal of 7902947856 is 6587492097.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a junction number, because it is equal to n+sod(n) for n = 7902947796 and 7902947805.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1056931 + ... + 1064381.

It is an arithmetic number, because the mean of its divisors is an integer number (268897968).

Almost surely, 2^7902947856 is an apocalyptic number.

7902947856 is a gapful number since it is divisible by the number (76) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7902947856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10755918720).

7902947856 is an abundant number, since it is smaller than the sum of its proper divisors (13608889584).

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

7902947856 is a wasteful number, since it uses less digits than its factorization.

7902947856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8644 (or 8638 counting only the distinct ones).

The product of its (nonzero) digits is 7620480, while the sum is 57.

The square root of 7902947856 is about 88898.5256120708. The cubic root of 7902947856 is about 1991.8793938367.

The spelling of 7902947856 in words is "seven billion, nine hundred two million, nine hundred forty-seven thousand, eight hundred fifty-six".