646981254 has 12 divisors (see below), whose sum is σ = 1401792756. Its totient is φ = 215660412.

The previous prime is 646981219. The next prime is 646981259. The reversal of 646981254 is 452189646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646981259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17971684 + ... + 17971719.

It is an arithmetic number, because the mean of its divisors is an integer number (116816063).

Almost surely, 2^646981254 is an apocalyptic number.

646981254 is an abundant number, since it is smaller than the sum of its proper divisors (754811502).

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

646981254 is a wasteful number, since it uses less digits than its factorization.

646981254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35943411 (or 35943408 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The square root of 646981254 is about 25435.8261906312. The cubic root of 646981254 is about 864.8960210030.

The spelling of 646981254 in words is "six hundred forty-six million, nine hundred eighty-one thousand, two hundred fifty-four".