764221 has 8 divisors (see below), whose sum is σ = 806400. Its totient is φ = 722832.

The previous prime is 764209. The next prime is 764233. The reversal of 764221 is 122467.

It is an interprime number because it is at equal distance from previous prime (764209) and next prime (764233).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 764221 - 2⁵ = 764189 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 764192 and 764201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (764251) 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, 3316 + ... + 3538.

It is an arithmetic number, because the mean of its divisors is an integer number (100800).

2⁷⁶⁴²²¹ is an apocalyptic number.

It is an amenable number.

764221 is a deficient number, since it is larger than the sum of its proper divisors (42179).

764221 is a wasteful number, since it uses less digits than its factorization.

764221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395.

The product of its digits is 672, while the sum is 22.

The square root of 764221 is about 874.1973461410. The cubic root of 764221 is about 91.4266883680.

Adding to 764221 its reverse (122467), we get a palindrome (886688).

The spelling of 764221 in words is "seven hundred sixty-four thousand, two hundred twenty-one".