64450821 has 8 divisors (see below), whose sum is σ = 86590944. Its totient is φ = 42638960.

The previous prime is 64450819. The next prime is 64450843. The reversal of 64450821 is 12805446.

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 64450821 - 2¹ = 64450819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64450801) 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, 81606 + ... + 82391.

It is an arithmetic number, because the mean of its divisors is an integer number (10823868).

Almost surely, 2^64450821 is an apocalyptic number.

It is an amenable number.

64450821 is a deficient number, since it is larger than the sum of its proper divisors (22140123).

64450821 is a wasteful number, since it uses less digits than its factorization.

64450821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164131.

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

The square root of 64450821 is about 8028.1268674579. The cubic root of 64450821 is about 400.9370137160.

The spelling of 64450821 in words is "sixty-four million, four hundred fifty thousand, eight hundred twenty-one".