64522821 has 8 divisors (see below), whose sum is σ = 93851424. Its totient is φ = 39104720.

The previous prime is 64522817. The next prime is 64522847. The reversal of 64522821 is 12822546.

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 64522821 - 2² = 64522817 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64522891) 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, 977586 + ... + 977651.

It is an arithmetic number, because the mean of its divisors is an integer number (11731428).

Almost surely, 2^64522821 is an apocalyptic number.

It is an amenable number.

64522821 is a deficient number, since it is larger than the sum of its proper divisors (29328603).

64522821 is a wasteful number, since it uses less digits than its factorization.

64522821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1955251.

The product of its digits is 7680, while the sum is 30.

The square root of 64522821 is about 8032.6098498558. The cubic root of 64522821 is about 401.0862578561.

The spelling of 64522821 in words is "sixty-four million, five hundred twenty-two thousand, eight hundred twenty-one".