9721477440 has 448 divisors, whose sum is σ = 35990784000. Its totient is φ = 2497775616.

The previous prime is 9721477439. The next prime is 9721477481. The reversal of 9721477440 is 447741279.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 20295121 + ... + 20295599.

Almost surely, 2^9721477440 is an apocalyptic number.

9721477440 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 9721477440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17995392000).

9721477440 is an abundant number, since it is smaller than the sum of its proper divisors (26269306560).

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

9721477440 is an equidigital number, since it uses as much as digits as its factorization.

9721477440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546 (or 518 counting only the distinct ones).

The product of its (nonzero) digits is 395136, while the sum is 45.

The square root of 9721477440 is about 98597.5529108101. The cubic root of 9721477440 is about 2134.2441067724.

The spelling of 9721477440 in words is "nine billion, seven hundred twenty-one million, four hundred seventy-seven thousand, four hundred forty".