64494521 has 16 divisors (see below), whose sum is σ = 82118400. Its totient is φ = 49267008.

The previous prime is 64494509. The next prime is 64494527. The reversal of 64494521 is 12549446.

It is not a de Polignac number, because 64494521 - 2¹⁰ = 64493497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64494527) 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, 9581 + ... + 14858.

It is an arithmetic number, because the mean of its divisors is an integer number (5132400).

Almost surely, 2^64494521 is an apocalyptic number.

It is an amenable number.

64494521 is a deficient number, since it is larger than the sum of its proper divisors (17623879).

64494521 is a wasteful number, since it uses less digits than its factorization.

64494521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24488.

The product of its digits is 34560, while the sum is 35.

The square root of 64494521 is about 8030.8480872197. The cubic root of 64494521 is about 401.0276098675.

The spelling of 64494521 in words is "sixty-four million, four hundred ninety-four thousand, five hundred twenty-one".