64468781 has 8 divisors (see below), whose sum is σ = 70406784. Its totient is φ = 58670640.

The previous prime is 64468771. The next prime is 64468801. The reversal of 64468781 is 18786446.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64468781 is a prime.

It is a super-2 number, since 2×64468781² = 8312447447251922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64468721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34001 + ... + 35846.

It is an arithmetic number, because the mean of its divisors is an integer number (8800848).

Almost surely, 2^64468781 is an apocalyptic number.

It is an amenable number.

64468781 is a deficient number, since it is larger than the sum of its proper divisors (5938003).

64468781 is a wasteful number, since it uses less digits than its factorization.

64468781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69931.

The product of its digits is 258048, while the sum is 44.

The square root of 64468781 is about 8029.2453568190. The cubic root of 64468781 is about 400.9742522383.

The spelling of 64468781 in words is "sixty-four million, four hundred sixty-eight thousand, seven hundred eighty-one".