646545489 has 8 divisors (see below), whose sum is σ = 880402560. Its totient is φ = 421859376.

The previous prime is 646545481. The next prime is 646545499. The reversal of 646545489 is 984545646.

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

It is not a de Polignac number, because 646545489 - 2³ = 646545481 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (646545481) 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, 2292574 + ... + 2292855.

It is an arithmetic number, because the mean of its divisors is an integer number (110050320).

Almost surely, 2^646545489 is an apocalyptic number.

It is an amenable number.

646545489 is a deficient number, since it is larger than the sum of its proper divisors (233857071).

646545489 is a wasteful number, since it uses less digits than its factorization.

646545489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4585479.

The product of its digits is 4147200, while the sum is 51.

The square root of 646545489 is about 25427.2587787201. The cubic root of 646545489 is about 864.7017979295.

The spelling of 646545489 in words is "six hundred forty-six million, five hundred forty-five thousand, four hundred eighty-nine".