64629533 has 4 divisors (see below), whose sum is σ = 64649628. Its totient is φ = 64609440.

The previous prime is 64629503. The next prime is 64629541. The reversal of 64629533 is 33592646.

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 7279204 + 57350329 = 2698^2 + 7573^2 .

It is a cyclic number.

It is not a de Polignac number, because 64629533 - 2¹⁶ = 64563997 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 (64629503) 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, 4016 + ... + 12057.

It is an arithmetic number, because the mean of its divisors is an integer number (16162407).

Almost surely, 2^64629533 is an apocalyptic number.

It is an amenable number.

64629533 is a deficient number, since it is larger than the sum of its proper divisors (20095).

64629533 is a wasteful number, since it uses less digits than its factorization.

64629533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20094.

The product of its digits is 116640, while the sum is 38.

The square root of 64629533 is about 8039.2495296514. The cubic root of 64629533 is about 401.3072501717.

The spelling of 64629533 in words is "sixty-four million, six hundred twenty-nine thousand, five hundred thirty-three".