64020331 has 4 divisors (see below), whose sum is σ = 64148112. Its totient is φ = 63892552.

The previous prime is 64020287. The next prime is 64020337. The reversal of 64020331 is 13302046.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64020331 - 2¹⁵ = 63987563 is a prime.

It is a super-2 number, since 2×64020331² = 8197205562699122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64020299 and 64020308.

It is not an unprimeable number, because it can be changed into a prime (64020337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63136 + ... + 64141.

It is an arithmetic number, because the mean of its divisors is an integer number (16037028).

Almost surely, 2^64020331 is an apocalyptic number.

64020331 is a deficient number, since it is larger than the sum of its proper divisors (127781).

64020331 is a wasteful number, since it uses less digits than its factorization.

64020331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127780.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 64020331 is about 8001.2705866006. The cubic root of 64020331 is about 400.0423517657.

Adding to 64020331 its reverse (13302046), we get a palindrome (77322377).

The spelling of 64020331 in words is "sixty-four million, twenty thousand, three hundred thirty-one".