646261542 has 24 divisors (see below), whose sum is σ = 1426654944. Its totient is φ = 211355664.

The previous prime is 646261541. The next prime is 646261547. The reversal of 646261542 is 245162646.

646261542 is a `hidden beast` number, since 646 + 2 + 6 + 1 + 5 + 4 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 646261497 and 646261506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646261541) 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 11 ways as a sum of consecutive naturals, for example, 337758 + ... + 339665.

It is an arithmetic number, because the mean of its divisors is an integer number (59443956).

Almost surely, 2^646261542 is an apocalyptic number.

646261542 is an abundant number, since it is smaller than the sum of its proper divisors (780393402).

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

646261542 is a wasteful number, since it uses less digits than its factorization.

646261542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 677484 (or 677481 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

The square root of 646261542 is about 25421.6746497944. The cubic root of 646261542 is about 864.5751940850.

The spelling of 646261542 in words is "six hundred forty-six million, two hundred sixty-one thousand, five hundred forty-two".