9975780 has 72 divisors (see below), whose sum is σ = 30538872. Its totient is φ = 2635776.

The previous prime is 9975773. The next prime is 9975803. The reversal of 9975780 is 875799.

9975780 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 278784 + 9696996 = 528^2 + 3114^2 .

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 23 ways as a sum of consecutive naturals, for example, 28084 + ... + 28436.

It is an arithmetic number, because the mean of its divisors is an integer number (424151).

Almost surely, 2^9975780 is an apocalyptic number.

9975780 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 9975780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15269436).

9975780 is an abundant number, since it is smaller than the sum of its proper divisors (20563092).

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

9975780 is a wasteful number, since it uses less digits than its factorization.

9975780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525 (or 520 counting only the distinct ones).

The product of its (nonzero) digits is 158760, while the sum is 45.

The square root of 9975780 is about 3158.4458203363. The cubic root of 9975780 is about 215.2693936967.

The spelling of 9975780 in words is "nine million, nine hundred seventy-five thousand, seven hundred eighty".