264621 has 8 divisors (see below), whose sum is σ = 403264. Its totient is φ = 151200.

The previous prime is 264619. The next prime is 264631. The reversal of 264621 is 126462.

It is a happy number.

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

It is not a de Polignac number, because 264621 - 2¹ = 264619 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 12601 = 264621 / (2 + 6 + 4 + 6 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (264601) 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, 6280 + ... + 6321.

It is an arithmetic number, because the mean of its divisors is an integer number (50408).

2²⁶⁴⁶²¹ is an apocalyptic number.

264621 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

264621 is a deficient number, since it is larger than the sum of its proper divisors (138643).

264621 is a wasteful number, since it uses less digits than its factorization.

264621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12611.

The product of its digits is 576, while the sum is 21.

The square root of 264621 is about 514.4132579940. The cubic root of 264621 is about 64.2009471818.

The spelling of 264621 in words is "two hundred sixty-four thousand, six hundred twenty-one".