64229821 has 8 divisors (see below), whose sum is σ = 66145464. Its totient is φ = 62330880.

The previous prime is 64229797. The next prime is 64229833. The reversal of 64229821 is 12892246.

It can be written as a sum of positive squares in 4 ways, for example, as 2842596 + 61387225 = 1686^2 + 7835^2 .

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 64229821 - 2⁹ = 64229309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64229881) 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, 3855 + ... + 11971.

It is an arithmetic number, because the mean of its divisors is an integer number (8268183).

Almost surely, 2^64229821 is an apocalyptic number.

It is an amenable number.

64229821 is a deficient number, since it is larger than the sum of its proper divisors (1915643).

64229821 is a wasteful number, since it uses less digits than its factorization.

64229821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8351.

The product of its digits is 13824, while the sum is 34.

The square root of 64229821 is about 8014.3509406564. The cubic root of 64229821 is about 400.4782217820.

The spelling of 64229821 in words is "sixty-four million, two hundred twenty-nine thousand, eight hundred twenty-one".