64874221 has 4 divisors (see below), whose sum is σ = 64892032. Its totient is φ = 64856412.

The previous prime is 64874203. The next prime is 64874263. The reversal of 64874221 is 12247846.

It is a happy number.

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 64874221 - 2⁹ = 64873709 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 (64874921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1245 + ... + 11458.

It is an arithmetic number, because the mean of its divisors is an integer number (16223008).

Almost surely, 2^64874221 is an apocalyptic number.

It is an amenable number.

64874221 is a deficient number, since it is larger than the sum of its proper divisors (17811).

64874221 is a wasteful number, since it uses less digits than its factorization.

64874221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17810.

The product of its digits is 21504, while the sum is 34.

The square root of 64874221 is about 8054.4534885987. The cubic root of 64874221 is about 401.8130633369.

The spelling of 64874221 in words is "sixty-four million, eight hundred seventy-four thousand, two hundred twenty-one".