64033821 has 20 divisors (see below), whose sum is σ = 97284000. Its totient is φ = 41962536.

The previous prime is 64033811. The next prime is 64033831. The reversal of 64033821 is 12833046.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (64033811) and next prime (64033831).

It is not a de Polignac number, because 64033821 - 2⁹ = 64033309 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64033811) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1921 + ... + 11478.

It is an arithmetic number, because the mean of its divisors is an integer number (4864200).

Almost surely, 2^64033821 is an apocalyptic number.

It is an amenable number.

64033821 is a deficient number, since it is larger than the sum of its proper divisors (33250179).

64033821 is a wasteful number, since it uses less digits than its factorization.

64033821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13470 (or 13461 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 64033821 is about 8002.1135333111. The cubic root of 64033821 is about 400.0704480086.

Adding to 64033821 its reverse (12833046), we get a palindrome (76866867).

The spelling of 64033821 in words is "sixty-four million, thirty-three thousand, eight hundred twenty-one".