764220 has 48 divisors (see below), whose sum is σ = 2193408. Its totient is φ = 198720.

The previous prime is 764209. The next prime is 764233. The reversal of 764220 is 22467.

It is a happy number.

It is a nialpdrome in base 10.

It is a congruent number.

It is an unprimeable number.

764220 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2685 + ... + 2955.

It is an arithmetic number, because the mean of its divisors is an integer number (45696).

2⁷⁶⁴²²⁰ 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 764220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1096704).

764220 is an abundant number, since it is smaller than the sum of its proper divisors (1429188).

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

764220 is a wasteful number, since it uses less digits than its factorization.

764220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330 (or 328 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 764220 is about 874.1967741876. The cubic root of 764220 is about 91.4266484901.

Adding to 764220 its reverse (22467), we get a palindrome (786687).

The spelling of 764220 in words is "seven hundred sixty-four thousand, two hundred twenty".