64456021 has 12 divisors (see below), whose sum is σ = 75933120. Its totient is φ = 54545400.

The previous prime is 64455997. The next prime is 64456033. The reversal of 64456021 is 12065446.

It is not a de Polignac number, because 64456021 - 2¹⁹ = 63931733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64456121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4455 + ... + 12196.

It is an arithmetic number, because the mean of its divisors is an integer number (6327760).

Almost surely, 2^64456021 is an apocalyptic number.

It is an amenable number.

64456021 is a deficient number, since it is larger than the sum of its proper divisors (11477099).

64456021 is a wasteful number, since it uses less digits than its factorization.

64456021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16744 (or 16737 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 64456021 is about 8028.4507222751. The cubic root of 64456021 is about 400.9477961822.

It can be divided in two parts, 644 and 56021, that added together give a palindrome (56665).

The spelling of 64456021 in words is "sixty-four million, four hundred fifty-six thousand, twenty-one".