9712780 has 144 divisors (see below), whose sum is σ = 27923616. Its totient is φ = 2795520.

The previous prime is 9712771. The next prime is 9712799. The reversal of 9712780 is 872179.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 183234 + ... + 183286.

It is an arithmetic number, because the mean of its divisors is an integer number (193914).

Almost surely, 2^9712780 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9712780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13961808).

9712780 is an abundant number, since it is smaller than the sum of its proper divisors (18210836).

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

9712780 is a wasteful number, since it uses less digits than its factorization.

9712780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104 (or 95 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 34.

The square root of 9712780 is about 3116.5333304812. The cubic root of 9712780 is about 213.3607440907.

The spelling of 9712780 in words is "nine million, seven hundred twelve thousand, seven hundred eighty".