7780061900 has 144 divisors (see below), whose sum is σ = 19359448416. Its totient is φ = 2688430080.

The previous prime is 7780061881. The next prime is 7780061923. The reversal of 7780061900 is 91600877.

It is a happy number.

It is a super-2 number, since 2×7780061900² (a number of 21 digits) contains 22 as substring.

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 in 47 ways as a sum of consecutive naturals, for example, 4352807 + ... + 4354593.

It is an arithmetic number, because the mean of its divisors is an integer number (134440614).

Almost surely, 2^7780061900 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7780061900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9679724208).

7780061900 is an abundant number, since it is smaller than the sum of its proper divisors (11579386516).

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

7780061900 is a wasteful number, since it uses less digits than its factorization.

7780061900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2028 (or 2021 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 38.

The square root of 7780061900 is about 88204.6591739915. The cubic root of 7780061900 is about 1981.5012506649.

The spelling of 7780061900 in words is "seven billion, seven hundred eighty million, sixty-one thousand, nine hundred".