764420 has 24 divisors (see below), whose sum is σ = 1650264. Its totient is φ = 297216.

The previous prime is 764399. The next prime is 764431. The reversal of 764420 is 24467.

It can be written as a sum of positive squares in 4 ways, for example, as 430336 + 334084 = 656^2 + 578^2 .

It is an Ulam number.

It is a nialpdrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 224 + ... + 1256.

It is an arithmetic number, because the mean of its divisors is an integer number (68761).

2⁷⁶⁴⁴²⁰ 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 764420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (825132).

764420 is an abundant number, since it is smaller than the sum of its proper divisors (885844).

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

764420 is a wasteful number, since it uses less digits than its factorization.

764420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1079 (or 1077 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 764420 is about 874.3111574262. The cubic root of 764420 is about 91.4346233903.

Adding to 764420 its reverse (24467), we get a palindrome (788887).

The spelling of 764420 in words is "seven hundred sixty-four thousand, four hundred twenty".