64263621 has 16 divisors (see below), whose sum is σ = 91096704. Its totient is φ = 40157184.

The previous prime is 64263611. The next prime is 64263659. The reversal of 64263621 is 12636246.

It is not a de Polignac number, because 64263621 - 2¹¹ = 64261573 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64263611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10656 + ... + 15558.

It is an arithmetic number, because the mean of its divisors is an integer number (5693544).

Almost surely, 2^64263621 is an apocalyptic number.

It is an amenable number.

64263621 is a deficient number, since it is larger than the sum of its proper divisors (26833083).

64263621 is a wasteful number, since it uses less digits than its factorization.

64263621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5180.

The product of its digits is 10368, while the sum is 30.

The square root of 64263621 is about 8016.4593805495. The cubic root of 64263621 is about 400.5484580574.

Adding to 64263621 its reverse (12636246), we get a palindrome (76899867).

The spelling of 64263621 in words is "sixty-four million, two hundred sixty-three thousand, six hundred twenty-one".