646254040 has 16 divisors (see below), whose sum is σ = 1454071680. Its totient is φ = 258501600.

The previous prime is 646254017. The next prime is 646254041. The reversal of 646254040 is 40452646.

It is a junction number, because it is equal to n+sod(n) for n = 646253993 and 646254011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646254041) by changing a digit.

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, 8078136 + ... + 8078215.

It is an arithmetic number, because the mean of its divisors is an integer number (90879480).

Almost surely, 2^646254040 is an apocalyptic number.

It is an amenable number.

646254040 is an abundant number, since it is smaller than the sum of its proper divisors (807817640).

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

646254040 is a wasteful number, since it uses less digits than its factorization.

646254040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16156362 (or 16156358 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 31.

The square root of 646254040 is about 25421.5270981112. The cubic root of 646254040 is about 864.5718486550.

The spelling of 646254040 in words is "six hundred forty-six million, two hundred fifty-four thousand, forty".