9977780 has 24 divisors (see below), whose sum is σ = 21350952. Its totient is φ = 3915392.

The previous prime is 9977777. The next prime is 9977783. The reversal of 9977780 is 877799.

It is an interprime number because it is at equal distance from previous prime (9977777) and next prime (9977783).

It can be written as a sum of positive squares in 4 ways, for example, as 5216656 + 4761124 = 2284^2 + 2182^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9977783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3647 + ... + 5766.

It is an arithmetic number, because the mean of its divisors is an integer number (889623).

Almost surely, 2^9977780 is an apocalyptic number.

It is an amenable number.

9977780 is an abundant number, since it is smaller than the sum of its proper divisors (11373172).

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

9977780 is a wasteful number, since it uses less digits than its factorization.

9977780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9475 (or 9473 counting only the distinct ones).

The product of its (nonzero) digits is 222264, while the sum is 47.

The square root of 9977780 is about 3158.7624158838. The cubic root of 9977780 is about 215.2837788715.

The spelling of 9977780 in words is "nine million, nine hundred seventy-seven thousand, seven hundred eighty".