9215781120 has 864 divisors, whose sum is σ = 40176864000. Its totient is φ = 1898643456.

The previous prime is 9215781097. The next prime is 9215781131. The reversal of 9215781120 is 211875129.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 61850806 + ... + 61850954.

It is an arithmetic number, because the mean of its divisors is an integer number (46501000).

Almost surely, 2^9215781120 is an apocalyptic number.

9215781120 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 9215781120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20088432000).

9215781120 is an abundant number, since it is smaller than the sum of its proper divisors (30961082880).

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

9215781120 is a wasteful number, since it uses less digits than its factorization.

9215781120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255 (or 238 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 36.

The square root of 9215781120 is about 95998.8599932312. The cubic root of 9215781120 is about 2096.5765172069.

The spelling of 9215781120 in words is "nine billion, two hundred fifteen million, seven hundred eighty-one thousand, one hundred twenty".