64281813 has 4 divisors (see below), whose sum is σ = 85709088. Its totient is φ = 42854540.

The previous prime is 64281797. The next prime is 64281823. The reversal of 64281813 is 31818246.

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 not a de Polignac number, because 64281813 - 2⁴ = 64281797 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64281823) 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, 10713633 + ... + 10713638.

It is an arithmetic number, because the mean of its divisors is an integer number (21427272).

Almost surely, 2^64281813 is an apocalyptic number.

It is an amenable number.

64281813 is a deficient number, since it is larger than the sum of its proper divisors (21427275).

64281813 is a wasteful number, since it uses less digits than its factorization.

64281813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21427274.

The product of its digits is 9216, while the sum is 33.

The square root of 64281813 is about 8017.5939657730. The cubic root of 64281813 is about 400.5862507720.

The spelling of 64281813 in words is "sixty-four million, two hundred eighty-one thousand, eight hundred thirteen".