64670533 has 4 divisors (see below), whose sum is σ = 68474700. Its totient is φ = 60866368.

The previous prime is 64670531. The next prime is 64670539. The reversal of 64670533 is 33507646.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 57790404 + 6880129 = 7602^2 + 2623^2 .

It is a cyclic number.

It is not a de Polignac number, because 64670533 - 2¹ = 64670531 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64670531) 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, 1902058 + ... + 1902091.

It is an arithmetic number, because the mean of its divisors is an integer number (17118675).

Almost surely, 2^64670533 is an apocalyptic number.

It is an amenable number.

64670533 is a deficient number, since it is larger than the sum of its proper divisors (3804167).

64670533 is a wasteful number, since it uses less digits than its factorization.

64670533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3804166.

The product of its (nonzero) digits is 45360, while the sum is 34.

The square root of 64670533 is about 8041.7991146260. The cubic root of 64670533 is about 401.3920933201.

The spelling of 64670533 in words is "sixty-four million, six hundred seventy thousand, five hundred thirty-three".