646104787 has 4 divisors (see below), whose sum is σ = 646916256. Its totient is φ = 645293320.

The previous prime is 646104763. The next prime is 646104793. The reversal of 646104787 is 787401646.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 646104787 - 2¹¹ = 646102739 is a prime.

It is a super-3 number, since 3×646104787³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646104727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 404539 + ... + 406132.

It is an arithmetic number, because the mean of its divisors is an integer number (161729064).

Almost surely, 2^646104787 is an apocalyptic number.

646104787 is a deficient number, since it is larger than the sum of its proper divisors (811469).

646104787 is an equidigital number, since it uses as much as digits as its factorization.

646104787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811468.

The product of its (nonzero) digits is 225792, while the sum is 43.

The square root of 646104787 is about 25418.5913653766. The cubic root of 646104787 is about 864.5052856270.

The spelling of 646104787 in words is "six hundred forty-six million, one hundred four thousand, seven hundred eighty-seven".