646738152 has 16 divisors (see below), whose sum is σ = 1616845440. Its totient is φ = 215579376.

The previous prime is 646738129. The next prime is 646738177. The reversal of 646738152 is 251837646.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13473688 + ... + 13473735.

It is an arithmetic number, because the mean of its divisors is an integer number (101052840).

Almost surely, 2^646738152 is an apocalyptic number.

It is an amenable number.

646738152 is an abundant number, since it is smaller than the sum of its proper divisors (970107288).

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

646738152 is a wasteful number, since it uses less digits than its factorization.

646738152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26947432 (or 26947428 counting only the distinct ones).

The product of its digits is 241920, while the sum is 42.

The square root of 646738152 is about 25431.0470095118. The cubic root of 646738152 is about 864.7876797431.

The spelling of 646738152 in words is "six hundred forty-six million, seven hundred thirty-eight thousand, one hundred fifty-two".