64004420 has 24 divisors (see below), whose sum is σ = 135221184. Its totient is φ = 25447136.

The previous prime is 64004419. The next prime is 64004453. The reversal of 64004420 is 2440046.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 64004392 and 64004401.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6242 + ... + 12921.

It is an arithmetic number, because the mean of its divisors is an integer number (5634216).

Almost surely, 2^64004420 is an apocalyptic number.

It is an amenable number.

64004420 is an abundant number, since it is smaller than the sum of its proper divisors (71216764).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64004420 is a wasteful number, since it uses less digits than its factorization.

64004420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19339 (or 19337 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 64004420 is about 8000.2762452305. The cubic root of 64004420 is about 400.0092081214.

Adding to 64004420 its reverse (2440046), we get a palindrome (66444466).

The spelling of 64004420 in words is "sixty-four million, four thousand, four hundred twenty".