64642441 has 8 divisors (see below), whose sum is σ = 66981384. Its totient is φ = 62334720.

The previous prime is 64642423. The next prime is 64642451. The reversal of 64642441 is 14424646.

It can be written as a sum of positive squares in 4 ways, for example, as 1201216 + 63441225 = 1096^2 + 7965^2 .

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 64642441 - 2¹¹ = 64640393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64642451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3550 + ... + 11911.

It is an arithmetic number, because the mean of its divisors is an integer number (8372673).

Almost surely, 2^64642441 is an apocalyptic number.

It is an amenable number.

64642441 is a deficient number, since it is larger than the sum of its proper divisors (2338943).

64642441 is a wasteful number, since it uses less digits than its factorization.

64642441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15611.

The product of its digits is 18432, while the sum is 31.

The square root of 64642441 is about 8040.0523008249. The cubic root of 64642441 is about 401.3339651472. Note that the first 3 decimals are identical.

The spelling of 64642441 in words is "sixty-four million, six hundred forty-two thousand, four hundred forty-one".