7725780 has 120 divisors (see below), whose sum is σ = 25613280. Its totient is φ = 1944000.

The previous prime is 7725733. The next prime is 7725787. The reversal of 7725780 is 875277.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7725787) 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 39 ways as a sum of consecutive naturals, for example, 30655 + ... + 30905.

It is an arithmetic number, because the mean of its divisors is an integer number (213444).

Almost surely, 2^7725780 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 7725780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12806640).

7725780 is an abundant number, since it is smaller than the sum of its proper divisors (17887500).

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

7725780 is a wasteful number, since it uses less digits than its factorization.

7725780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291 (or 280 counting only the distinct ones).

The product of its (nonzero) digits is 27440, while the sum is 36.

The square root of 7725780 is about 2779.5287370344. The cubic root of 7725780 is about 197.6882145314.

The spelling of 7725780 in words is "seven million, seven hundred twenty-five thousand, seven hundred eighty".