646787542 has 8 divisors (see below), whose sum is σ = 1027250856. Its totient is φ = 304370592.

The previous prime is 646787513. The next prime is 646787591. The reversal of 646787542 is 245787646.

646787542 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×646787542³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9511548 + ... + 9511615.

It is an arithmetic number, because the mean of its divisors is an integer number (128406357).

Almost surely, 2^646787542 is an apocalyptic number.

646787542 is a deficient number, since it is larger than the sum of its proper divisors (380463314).

646787542 is a wasteful number, since it uses less digits than its factorization.

646787542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19023182.

The product of its digits is 2257920, while the sum is 49.

The square root of 646787542 is about 25432.0180481219. The cubic root of 646787542 is about 864.8096931737.

The spelling of 646787542 in words is "six hundred forty-six million, seven hundred eighty-seven thousand, five hundred forty-two".