64821222 has 56 divisors (see below), whose sum is σ = 152198064. Its totient is φ = 20656944.

The previous prime is 64821209. The next prime is 64821233. The reversal of 64821222 is 22212846.

It is a happy number.

64821222 is a `hidden beast` number, since 648 + 2 + 12 + 2 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 32568 + ... + 34500.

Almost surely, 2^64821222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64821222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76099032).

64821222 is an abundant number, since it is smaller than the sum of its proper divisors (87376842).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64821222 is a wasteful number, since it uses less digits than its factorization.

64821222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1976 (or 1961 counting only the distinct ones).

The product of its digits is 3072, while the sum is 27.

The square root of 64821222 is about 8051.1627731651. The cubic root of 64821222 is about 401.7036131217.

The spelling of 64821222 in words is "sixty-four million, eight hundred twenty-one thousand, two hundred twenty-two".