9561942720 has 504 divisors, whose sum is σ = 37754222688. Its totient is φ = 2215403520.

The previous prime is 9561942661. The next prime is 9561942763. The reversal of 9561942720 is 272491659.

9561942720 is a `hidden beast` number, since 9 + 5 + 619 + 4 + 2 + 7 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 8014444 + ... + 8015636.

It is an arithmetic number, because the mean of its divisors is an integer number (74909172).

Almost surely, 2^9561942720 is an apocalyptic number.

9561942720 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 9561942720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18877111344).

9561942720 is an abundant number, since it is smaller than the sum of its proper divisors (28192279968).

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

9561942720 is a wasteful number, since it uses less digits than its factorization.

9561942720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1261 (or 1237 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The square root of 9561942720 is about 97785.1866081975. The cubic root of 9561942720 is about 2122.5049540604.

The spelling of 9561942720 in words is "nine billion, five hundred sixty-one million, nine hundred forty-two thousand, seven hundred twenty".