64221406 has 16 divisors (see below), whose sum is σ = 101998800. Its totient is φ = 30241728.

The previous prime is 64221389. The next prime is 64221419. The reversal of 64221406 is 60412246.

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 7 ways as a sum of consecutive naturals, for example, 1690 + ... + 11458.

It is an arithmetic number, because the mean of its divisors is an integer number (6374925).

Almost surely, 2^64221406 is an apocalyptic number.

64221406 is a deficient number, since it is larger than the sum of its proper divisors (37777394).

64221406 is a wasteful number, since it uses less digits than its factorization.

64221406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9963.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 64221406 is about 8013.8259277326. The cubic root of 64221406 is about 400.4607316122.

The spelling of 64221406 in words is "sixty-four million, two hundred twenty-one thousand, four hundred six".