64405481 has 16 divisors (see below), whose sum is σ = 74718720. Its totient is φ = 54378240.

The previous prime is 64405457. The next prime is 64405483. The reversal of 64405481 is 18450446.

It is not a de Polignac number, because 64405481 - 2⁶ = 64405417 is a prime.

It is a super-2 number, since 2×64405481² = 8296131965682722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64405483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 229061 + ... + 229341.

It is an arithmetic number, because the mean of its divisors is an integer number (4669920).

Almost surely, 2^64405481 is an apocalyptic number.

It is an amenable number.

64405481 is a deficient number, since it is larger than the sum of its proper divisors (10313239).

64405481 is a wasteful number, since it uses less digits than its factorization.

64405481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 664.

The product of its (nonzero) digits is 15360, while the sum is 32.

The square root of 64405481 is about 8025.3025488140. The cubic root of 64405481 is about 400.8429743211.

The spelling of 64405481 in words is "sixty-four million, four hundred five thousand, four hundred eighty-one".