64220641 has 8 divisors (see below), whose sum is σ = 66436160. Its totient is φ = 62030448.

The previous prime is 64220633. The next prime is 64220647. The reversal of 64220641 is 14602246.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64220641 - 2³ = 64220633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64220647) 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 7 ways as a sum of consecutive naturals, for example, 1101 + ... + 11386.

It is an arithmetic number, because the mean of its divisors is an integer number (8304520).

Almost surely, 2^64220641 is an apocalyptic number.

It is an amenable number.

64220641 is a deficient number, since it is larger than the sum of its proper divisors (2215519).

64220641 is a wasteful number, since it uses less digits than its factorization.

64220641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12663.

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

The square root of 64220641 is about 8013.7781975795. The cubic root of 64220641 is about 400.4591415210.

Adding to 64220641 its reverse (14602246), we get a palindrome (78822887).

The spelling of 64220641 in words is "sixty-four million, two hundred twenty thousand, six hundred forty-one".