646484869 has 8 divisors (see below), whose sum is σ = 653681952. Its totient is φ = 639322320.

The previous prime is 646484837. The next prime is 646484933. The reversal of 646484869 is 968484646.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 646484869 - 2⁵ = 646484837 is a prime.

It is a super-2 number, since 2×646484869² = 835885371691894322, 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 (646484369) 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, 29962 + ... + 46804.

It is an arithmetic number, because the mean of its divisors is an integer number (81710244).

Almost surely, 2^646484869 is an apocalyptic number.

It is an amenable number.

646484869 is a deficient number, since it is larger than the sum of its proper divisors (7197083).

646484869 is a wasteful number, since it uses less digits than its factorization.

646484869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17267.

The product of its digits is 7962624, while the sum is 55.

The square root of 646484869 is about 25426.0667229519. The cubic root of 646484869 is about 864.6747723182.

The spelling of 646484869 in words is "six hundred forty-six million, four hundred eighty-four thousand, eight hundred sixty-nine".