64803281 has 4 divisors (see below), whose sum is σ = 68214000. Its totient is φ = 61392564.

The previous prime is 64803257. The next prime is 64803283. The reversal of 64803281 is 18230846.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64803281 is a prime.

It is a super-2 number, since 2×64803281² = 8398930456729922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64803283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1705331 + ... + 1705368.

It is an arithmetic number, because the mean of its divisors is an integer number (17053500).

Almost surely, 2^64803281 is an apocalyptic number.

It is an amenable number.

64803281 is a deficient number, since it is larger than the sum of its proper divisors (3410719).

64803281 is a wasteful number, since it uses less digits than its factorization.

64803281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3410718.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 64803281 is about 8050.0485091706. The cubic root of 64803281 is about 401.6665489766. Note that the first 3 decimals are identical.

The spelling of 64803281 in words is "sixty-four million, eight hundred three thousand, two hundred eighty-one".