64221140 has 24 divisors (see below), whose sum is σ = 141963360. Its totient is φ = 24336288.

The previous prime is 64221139. The next prime is 64221163. The reversal of 64221140 is 4112246.

It is a super-3 number, since 3×64221140³ (a number of 24 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84122 + ... + 84881.

It is an arithmetic number, because the mean of its divisors is an integer number (5915140).

Almost surely, 2^64221140 is an apocalyptic number.

It is an amenable number.

64221140 is an abundant number, since it is smaller than the sum of its proper divisors (77742220).

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

64221140 is a wasteful number, since it uses less digits than its factorization.

64221140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169031 (or 169029 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 64221140 is about 8013.8093313979. The cubic root of 64221140 is about 400.4601787192.

Adding to 64221140 its reverse (4112246), we get a palindrome (68333386).

The spelling of 64221140 in words is "sixty-four million, two hundred twenty-one thousand, one hundred forty".