646051374 has 48 divisors (see below), whose sum is σ = 1486499040. Its totient is φ = 202083840.

The previous prime is 646051363. The next prime is 646051379. The reversal of 646051374 is 473150646.

It is a happy number.

646051374 is a `hidden beast` number, since 646 + 0 + 5 + 1 + 3 + 7 + 4 = 666.

646051374 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 not an unprimeable number, because it can be changed into a prime (646051379) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 106914 + ... + 112794.

It is an arithmetic number, because the mean of its divisors is an integer number (30968730).

Almost surely, 2^646051374 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646051374, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (743249520).

646051374 is an abundant number, since it is smaller than the sum of its proper divisors (840447666).

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

646051374 is a wasteful number, since it uses less digits than its factorization.

646051374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6265 (or 6262 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The square root of 646051374 is about 25417.5406756830. The cubic root of 646051374 is about 864.4814623018.

The spelling of 646051374 in words is "six hundred forty-six million, fifty-one thousand, three hundred seventy-four".