7800866900 has 36 divisors (see below), whose sum is σ = 16957344348. Its totient is φ = 3114915840.

The previous prime is 7800866893. The next prime is 7800866911. The reversal of 7800866900 is 96680087.

It can be written as a sum of positive squares in 6 ways, for example, as 2917264 + 7797949636 = 1708^2 + 88306^2 .

It is a super-2 number, since 2×7800866900² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 in 11 ways as a sum of consecutive naturals, for example, 9899 + ... + 125298.

It is an arithmetic number, because the mean of its divisors is an integer number (471037343).

Almost surely, 2^7800866900 is an apocalyptic number.

It is an amenable number.

7800866900 is an abundant number, since it is smaller than the sum of its proper divisors (9156477448).

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

7800866900 is a wasteful number, since it uses less digits than its factorization.

7800866900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135788 (or 135781 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 7800866900 is about 88322.5163817245. The cubic root of 7800866900 is about 1983.2659513079.

The spelling of 7800866900 in words is "seven billion, eight hundred million, eight hundred sixty-six thousand, nine hundred".