64860221 has 4 divisors (see below), whose sum is σ = 65828352. Its totient is φ = 63892092.

The previous prime is 64860217. The next prime is 64860247. The reversal of 64860221 is 12206846.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12206846 = 2 ⋅6103423.

It is a cyclic number.

It is not a de Polignac number, because 64860221 - 2² = 64860217 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 (64860251) 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, 483965 + ... + 484098.

It is an arithmetic number, because the mean of its divisors is an integer number (16457088).

Almost surely, 2^64860221 is an apocalyptic number.

It is an amenable number.

64860221 is a deficient number, since it is larger than the sum of its proper divisors (968131).

64860221 is an equidigital number, since it uses as much as digits as its factorization.

64860221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 968130.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 64860221 is about 8053.5843572909. The cubic root of 64860221 is about 401.7841572090.

The spelling of 64860221 in words is "sixty-four million, eight hundred sixty thousand, two hundred twenty-one".