64781293 has 4 divisors (see below), whose sum is σ = 64797408. Its totient is φ = 64765180.

The previous prime is 64781257. The next prime is 64781309. The reversal of 64781293 is 39218746.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64781293 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64781243) 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 3 ways as a sum of consecutive naturals, for example, 3480 + ... + 11902.

It is an arithmetic number, because the mean of its divisors is an integer number (16199352).

It is a vampire number, since it can be written as 7691 ⋅ 8423 (with its own digits).

Almost surely, 2^64781293 is an apocalyptic number.

It is an amenable number.

64781293 is a deficient number, since it is larger than the sum of its proper divisors (16115).

64781293 is an equidigital number, since it uses as much as digits as its factorization.

64781293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16114.

The product of its digits is 72576, while the sum is 40.

The square root of 64781293 is about 8048.6826872476. The cubic root of 64781293 is about 401.6211148410.

The spelling of 64781293 in words is "sixty-four million, seven hundred eighty-one thousand, two hundred ninety-three".