646738146 has 48 divisors (see below), whose sum is σ = 1439998560. Its totient is φ = 209664000.

The previous prime is 646738129. The next prime is 646738177. The reversal of 646738146 is 641837646.

It is a happy number.

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 23 ways as a sum of consecutive naturals, for example, 192610 + ... + 195938.

It is an arithmetic number, because the mean of its divisors is an integer number (29999970).

Almost surely, 2^646738146 is an apocalyptic number.

646738146 is an abundant number, since it is smaller than the sum of its proper divisors (793260414).

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

646738146 is a wasteful number, since it uses less digits than its factorization.

646738146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3631 (or 3628 counting only the distinct ones).

The product of its digits is 580608, while the sum is 45.

The square root of 646738146 is about 25431.0468915458. The cubic root of 646738146 is about 864.7876770688.

The spelling of 646738146 in words is "six hundred forty-six million, seven hundred thirty-eight thousand, one hundred forty-six".