775720 has 64 divisors (see below), whose sum is σ = 1995840. Its totient is φ = 268800.

The previous prime is 775711. The next prime is 775729. The reversal of 775720 is 27577.

775720 = T₈₉ + T₉₀ + ... + T₁₇₄.

It is a happy number.

775720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (775711) and next prime (775729).

It is not an unprimeable number, because it can be changed into a prime (775729) by changing a digit.

775720 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18019 + ... + 18061.

It is an arithmetic number, because the mean of its divisors is an integer number (31185).

2⁷⁷⁵⁷²⁰ 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 775720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (997920).

775720 is an abundant number, since it is smaller than the sum of its proper divisors (1220120).

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

775720 is a wasteful number, since it uses less digits than its factorization.

775720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106 (or 102 counting only the distinct ones).

The product of its (nonzero) digits is 3430, while the sum is 28.

The square root of 775720 is about 880.7496806698. The cubic root of 775720 is about 91.8829639694.

It can be divided in two parts, 7757 and 20, that added together give a palindrome (7777).

The spelling of 775720 in words is "seven hundred seventy-five thousand, seven hundred twenty".