7778890000 has 100 divisors (see below), whose sum is σ = 21524160064. Its totient is φ = 2667024000.

The previous prime is 7778889983. The next prime is 7778890057. The reversal of 7778890000 is 988777.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (100).

It is a super-2 number, since 2×7778890000² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 14437 + ... + 125563.

Almost surely, 2^7778890000 is an apocalyptic number.

7778890000 is a gapful number since it is divisible by the number (70) 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 7778890000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10762080032).

7778890000 is an abundant number, since it is smaller than the sum of its proper divisors (13745270064).

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

7778890000 is a wasteful number, since it uses less digits than its factorization.

7778890000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111162 (or 111141 counting only the distinct ones).

The product of its (nonzero) digits is 197568, while the sum is 46.

The square root of 7778890000 is about 88198.0158506981. The cubic root of 7778890000 is about 1981.4017554018.

The spelling of 7778890000 in words is "seven billion, seven hundred seventy-eight million, eight hundred ninety thousand".