646738158 has 32 divisors (see below), whose sum is σ = 1428077952. Its totient is φ = 193618400.

The previous prime is 646738129. The next prime is 646738177. The reversal of 646738158 is 851837646.

646738158 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53553 + ... + 64508.

It is an arithmetic number, because the mean of its divisors is an integer number (44627436).

Almost surely, 2^646738158 is an apocalyptic number.

646738158 is an abundant number, since it is smaller than the sum of its proper divisors (781339794).

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

646738158 is a wasteful number, since it uses less digits than its factorization.

646738158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118160.

The product of its digits is 967680, while the sum is 48.

The square root of 646738158 is about 25431.0471274779. The cubic root of 646738158 is about 864.7876824174.

The spelling of 646738158 in words is "six hundred forty-six million, seven hundred thirty-eight thousand, one hundred fifty-eight".