65228821 has 4 divisors (see below), whose sum is σ = 74547232. Its totient is φ = 55910412.

The previous prime is 65228797. The next prime is 65228831. The reversal of 65228821 is 12882256.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 65228821 - 2⁷ = 65228693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65228831) 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, 4659195 + ... + 4659208.

It is an arithmetic number, because the mean of its divisors is an integer number (18636808).

Almost surely, 2^65228821 is an apocalyptic number.

It is an amenable number.

65228821 is a deficient number, since it is larger than the sum of its proper divisors (9318411).

65228821 is an equidigital number, since it uses as much as digits as its factorization.

65228821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9318410.

The product of its digits is 15360, while the sum is 34.

The square root of 65228821 is about 8076.4361571178. The cubic root of 65228821 is about 402.5438317555.

It can be divided in two parts, 65228 and 821, that added together give a square (66049 = 257²).

The spelling of 65228821 in words is "sixty-five million, two hundred twenty-eight thousand, eight hundred twenty-one".