64521442 has 8 divisors (see below), whose sum is σ = 96922332. Its totient is φ = 32214000.

The previous prime is 64521427. The next prime is 64521449. The reversal of 64521442 is 24412546.

It can be written as a sum of positive squares in 2 ways, for example, as 48288601 + 16232841 = 6949^2 + 4029^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 64521442.

It is not an unprimeable number, because it can be changed into a prime (64521449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21609 + ... + 24412.

Almost surely, 2^64521442 is an apocalyptic number.

64521442 is a deficient number, since it is larger than the sum of its proper divisors (32400890).

64521442 is a wasteful number, since it uses less digits than its factorization.

64521442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46724.

The product of its digits is 7680, while the sum is 28.

The square root of 64521442 is about 8032.5240117911. The cubic root of 64521442 is about 401.0834004593.

Adding to 64521442 its reverse (24412546), we get a palindrome (88933988).

The spelling of 64521442 in words is "sixty-four million, five hundred twenty-one thousand, four hundred forty-two".