7781746980 has 96 divisors (see below), whose sum is σ = 25480756224. Its totient is φ = 1737316224.

The previous prime is 7781746979. The next prime is 7781746997. The reversal of 7781746980 is 896471877.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 7781746980.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 197382 + ... + 233501.

It is an arithmetic number, because the mean of its divisors is an integer number (265424544).

Almost surely, 2^7781746980 is an apocalyptic number.

7781746980 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

7781746980 is an abundant number, since it is smaller than the sum of its proper divisors (17699009244).

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

7781746980 is a wasteful number, since it uses less digits than its factorization.

7781746980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430945 (or 430943 counting only the distinct ones).

The product of its (nonzero) digits is 4741632, while the sum is 57.

The square root of 7781746980 is about 88214.2107599450. The cubic root of 7781746980 is about 1981.6442978170.

The spelling of 7781746980 in words is "seven billion, seven hundred eighty-one million, seven hundred forty-six thousand, nine hundred eighty".