64933621 has 4 divisors (see below), whose sum is σ = 68351200. Its totient is φ = 61516044.

The previous prime is 64933619. The next prime is 64933633. The reversal of 64933621 is 12633946.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 64933621 - 2¹ = 64933619 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 (64933651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1708761 + ... + 1708798.

It is an arithmetic number, because the mean of its divisors is an integer number (17087800).

Almost surely, 2^64933621 is an apocalyptic number.

It is an amenable number.

64933621 is a deficient number, since it is larger than the sum of its proper divisors (3417579).

64933621 is a wasteful number, since it uses less digits than its factorization.

64933621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3417578.

The product of its digits is 23328, while the sum is 34.

The square root of 64933621 is about 8058.1400459411. The cubic root of 64933621 is about 401.9356616753.

The spelling of 64933621 in words is "sixty-four million, nine hundred thirty-three thousand, six hundred twenty-one".