9861778080 has 768 divisors, whose sum is σ = 44939059200. Its totient is φ = 1958584320.

The previous prime is 9861778051. The next prime is 9861778109. The reversal of 9861778080 is 808771689.

It is an interprime number because it is at equal distance from previous prime (9861778051) and next prime (9861778109).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 7650076 + ... + 7651364.

It is an arithmetic number, because the mean of its divisors is an integer number (58514400).

Almost surely, 2^9861778080 is an apocalyptic number.

9861778080 is a gapful number since it is divisible by the number (90) 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 9861778080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22469529600).

9861778080 is an abundant number, since it is smaller than the sum of its proper divisors (35077281120).

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

9861778080 is a wasteful number, since it uses less digits than its factorization.

9861778080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1354 (or 1340 counting only the distinct ones).

The product of its (nonzero) digits is 1354752, while the sum is 54.

The square root of 9861778080 is about 99306.4855888073. The cubic root of 9861778080 is about 2144.4622643442.

The spelling of 9861778080 in words is "nine billion, eight hundred sixty-one million, seven hundred seventy-eight thousand, eighty".