64490321 has 12 divisors (see below), whose sum is σ = 78282432. Its totient is φ = 52873128.

The previous prime is 64490311. The next prime is 64490357. The reversal of 64490321 is 12309446.

It is not a de Polignac number, because 64490321 - 2¹⁰ = 64489297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64490311) 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, 27485 + ... + 29738.

It is an arithmetic number, because the mean of its divisors is an integer number (6523536).

Almost surely, 2^64490321 is an apocalyptic number.

It is an amenable number.

64490321 is a deficient number, since it is larger than the sum of its proper divisors (13792111).

64490321 is a wasteful number, since it uses less digits than its factorization.

64490321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57260 (or 57253 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 64490321 is about 8030.5865912771. The cubic root of 64490321 is about 401.0189044638.

Adding to 64490321 its reverse (12309446), we get a palindrome (76799767).

The spelling of 64490321 in words is "sixty-four million, four hundred ninety thousand, three hundred twenty-one".