64089621 has 12 divisors (see below), whose sum is σ = 92840748. Its totient is φ = 42603264.

The previous prime is 64089607. The next prime is 64089647. The reversal of 64089621 is 12698046.

64089621 is a `hidden beast` number, since 640 + 8 + 9 + 6 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 51408900 + 12680721 = 7170^2 + 3561^2 .

It is not a de Polignac number, because 64089621 - 2²⁵ = 30535189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64089671) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6910 + ... + 13263.

It is an arithmetic number, because the mean of its divisors is an integer number (7736729).

Almost surely, 2^64089621 is an apocalyptic number.

It is an amenable number.

64089621 is a deficient number, since it is larger than the sum of its proper divisors (28751127).

64089621 is a wasteful number, since it uses less digits than its factorization.

64089621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20532 (or 20529 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 64089621 is about 8005.5993529529. The cubic root of 64089621 is about 400.1866233325.

The spelling of 64089621 in words is "sixty-four million, eighty-nine thousand, six hundred twenty-one".