64288821 has 8 divisors (see below), whose sum is σ = 86232384. Its totient is φ = 42602240.

The previous prime is 64288817. The next prime is 64288843. The reversal of 64288821 is 12888246.

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

It is a cyclic number.

It is not a de Polignac number, because 64288821 - 2² = 64288817 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 64288821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64288801) 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, 63660 + ... + 64661.

It is an arithmetic number, because the mean of its divisors is an integer number (10779048).

Almost surely, 2^64288821 is an apocalyptic number.

It is an amenable number.

64288821 is a deficient number, since it is larger than the sum of its proper divisors (21943563).

64288821 is a wasteful number, since it uses less digits than its factorization.

64288821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128491.

The product of its digits is 49152, while the sum is 39.

The square root of 64288821 is about 8018.0309927064. The cubic root of 64288821 is about 400.6008075406.

The spelling of 64288821 in words is "sixty-four million, two hundred eighty-eight thousand, eight hundred twenty-one".