64273521 has 8 divisors (see below), whose sum is σ = 92290240. Its totient is φ = 39552912.

The previous prime is 64273513. The next prime is 64273529. The reversal of 64273521 is 12537246.

It is an interprime number because it is at equal distance from previous prime (64273513) and next prime (64273529).

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

It is not a de Polignac number, because 64273521 - 2³ = 64273513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64273529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 823981 + ... + 824058.

It is an arithmetic number, because the mean of its divisors is an integer number (11536280).

Almost surely, 2^64273521 is an apocalyptic number.

It is an amenable number.

64273521 is a deficient number, since it is larger than the sum of its proper divisors (28016719).

64273521 is a wasteful number, since it uses less digits than its factorization.

64273521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1648055.

The product of its digits is 10080, while the sum is 30.

The square root of 64273521 is about 8017.0768363538. The cubic root of 64273521 is about 400.5690255576.

The spelling of 64273521 in words is "sixty-four million, two hundred seventy-three thousand, five hundred twenty-one".