64221471 has 16 divisors (see below), whose sum is σ = 96705120. Its totient is φ = 42111360.

The previous prime is 64221433. The next prime is 64221481. The reversal of 64221471 is 17412246.

64221471 is a `hidden beast` number, since 642 + 2 + 14 + 7 + 1 = 666.

It is not a de Polignac number, because 64221471 - 2⁷ = 64221343 is a prime.

It is a super-3 number, since 3×64221471³ (a number of 24 digits) contains 333 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64221431) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 17850 + ... + 21143.

It is an arithmetic number, because the mean of its divisors is an integer number (6044070).

Almost surely, 2^64221471 is an apocalyptic number.

64221471 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

64221471 is a deficient number, since it is larger than the sum of its proper divisors (32483649).

64221471 is a wasteful number, since it uses less digits than its factorization.

64221471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39063 (or 39057 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 64221471 is about 8013.8299832228. The cubic root of 64221471 is about 400.4608667174.

The spelling of 64221471 in words is "sixty-four million, two hundred twenty-one thousand, four hundred seventy-one".