64235521 has 12 divisors (see below), whose sum is σ = 74856960. Its totient is φ = 54960360.

The previous prime is 64235519. The next prime is 64235531. The reversal of 64235521 is 12553246.

It is not a de Polignac number, because 64235521 - 2¹ = 64235519 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64235521.

It is not an unprimeable number, because it can be changed into a prime (64235531) 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, 43920 + ... + 45358.

It is an arithmetic number, because the mean of its divisors is an integer number (6238080).

Almost surely, 2^64235521 is an apocalyptic number.

It is an amenable number.

64235521 is a deficient number, since it is larger than the sum of its proper divisors (10621439).

64235521 is a wasteful number, since it uses less digits than its factorization.

64235521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2364 (or 2357 counting only the distinct ones).

The product of its digits is 7200, while the sum is 28.

The square root of 64235521 is about 8014.7065448462. The cubic root of 64235521 is about 400.4900680880.

Adding to 64235521 its reverse (12553246), we get a palindrome (76788767).

It can be divided in two parts, 642 and 35521, that added together give a palindrome (36163).

The spelling of 64235521 in words is "sixty-four million, two hundred thirty-five thousand, five hundred twenty-one".