646616089 has 16 divisors (see below), whose sum is σ = 771932160. Its totient is φ = 529586640.

The previous prime is 646616053. The next prime is 646616111. The reversal of 646616089 is 980616646.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646616089 is a prime.

It is a super-2 number, since 2×646616089² = 836224733107311842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646616389) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 230284 + ... + 233074.

It is an arithmetic number, because the mean of its divisors is an integer number (48245760).

Almost surely, 2^646616089 is an apocalyptic number.

It is an amenable number.

646616089 is a deficient number, since it is larger than the sum of its proper divisors (125316071).

646616089 is a wasteful number, since it uses less digits than its factorization.

646616089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4260.

The product of its (nonzero) digits is 373248, while the sum is 46.

The square root of 646616089 is about 25428.6470147352. The cubic root of 646616089 is about 864.7332706957.

The spelling of 646616089 in words is "six hundred forty-six million, six hundred sixteen thousand, eighty-nine".