9857778840 has 1024 divisors, whose sum is σ = 43545600000. Its totient is φ = 1967099904.

The previous prime is 9857778839. The next prime is 9857778859. The reversal of 9857778840 is 488777589.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 110761516 + ... + 110761604.

It is an arithmetic number, because the mean of its divisors is an integer number (42525000).

Almost surely, 2^9857778840 is an apocalyptic number.

9857778840 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 9857778840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21772800000).

9857778840 is an abundant number, since it is smaller than the sum of its proper divisors (33687821160).

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

9857778840 is a wasteful number, since it uses less digits than its factorization.

9857778840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166 (or 142 counting only the distinct ones).

The product of its (nonzero) digits is 31610880, while the sum is 63.

The square root of 9857778840 is about 99286.3477019877. The cubic root of 9857778840 is about 2144.1723443873.

The spelling of 9857778840 in words is "nine billion, eight hundred fifty-seven million, seven hundred seventy-eight thousand, eight hundred forty".