771220 has 12 divisors (see below), whose sum is σ = 1619604. Its totient is φ = 308480.

The previous prime is 771217. The next prime is 771227. The reversal of 771220 is 22177.

It can be written as a sum of positive squares in 2 ways, for example, as 226576 + 544644 = 476^2 + 738^2 .

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (771227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19261 + ... + 19300.

It is an arithmetic number, because the mean of its divisors is an integer number (134967).

2⁷⁷¹²²⁰ is an apocalyptic number.

It is an amenable number.

771220 is an abundant number, since it is smaller than the sum of its proper divisors (848384).

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

771220 is a wasteful number, since it uses less digits than its factorization.

771220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38570 (or 38568 counting only the distinct ones).

The product of its (nonzero) digits is 196, while the sum is 19.

The square root of 771220 is about 878.1913231181. The cubic root of 771220 is about 91.7049463631.

Adding to 771220 its reverse (22177), we get a palindrome (793397).

The spelling of 771220 in words is "seven hundred seventy-one thousand, two hundred twenty", and thus it is an iban number.