646433152 has 32 divisors (see below), whose sum is σ = 1307054520. Its totient is φ = 318388224.

The previous prime is 646433141. The next prime is 646433153. The reversal of 646433152 is 251334646.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646433153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29113 + ... + 46264.

Almost surely, 2^646433152 is an apocalyptic number.

It is an amenable number.

646433152 is an abundant number, since it is smaller than the sum of its proper divisors (660621368).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

646433152 is an equidigital number, since it uses as much as digits as its factorization.

646433152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75458 (or 75446 counting only the distinct ones).

The product of its digits is 51840, while the sum is 34.

The square root of 646433152 is about 25425.0496951333. The cubic root of 646433152 is about 864.6517145072.

Adding to 646433152 its reverse (251334646), we get a palindrome (897767798).

The spelling of 646433152 in words is "six hundred forty-six million, four hundred thirty-three thousand, one hundred fifty-two".