64036821 has 16 divisors (see below), whose sum is σ = 90357440. Its totient is φ = 40227840.

The previous prime is 64036813. The next prime is 64036837. The reversal of 64036821 is 12863046.

It is not a de Polignac number, because 64036821 - 2³ = 64036813 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64036801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8091 + ... + 13911.

It is an arithmetic number, because the mean of its divisors is an integer number (5647340).

Almost surely, 2^64036821 is an apocalyptic number.

It is an amenable number.

64036821 is a deficient number, since it is larger than the sum of its proper divisors (26320619).

64036821 is a wasteful number, since it uses less digits than its factorization.

64036821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6036.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 64036821 is about 8002.3009815927. The cubic root of 64036821 is about 400.0766957101.

Adding to 64036821 its reverse (12863046), we get a palindrome (76899867).

The spelling of 64036821 in words is "sixty-four million, thirty-six thousand, eight hundred twenty-one".