771280 has 40 divisors (see below), whose sum is σ = 1857024. Its totient is φ = 297600.

The previous prime is 771269. The next prime is 771283. The reversal of 771280 is 82177.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (771283) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2325 + ... + 2635.

2⁷⁷¹²⁸⁰ 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 771280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (928512).

771280 is an abundant number, since it is smaller than the sum of its proper divisors (1085744).

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

771280 is a wasteful number, since it uses less digits than its factorization.

771280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355 (or 349 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 25.

The square root of 771280 is about 878.2254835747. The cubic root of 771280 is about 91.7073244800.

The spelling of 771280 in words is "seven hundred seventy-one thousand, two hundred eighty".