646026487 has 4 divisors (see below), whose sum is σ = 658215720. Its totient is φ = 633837256.

The previous prime is 646026481. The next prime is 646026523. The reversal of 646026487 is 784620646.

646026487 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646026487 is a prime.

It is a super-2 number, since 2×646026487² = 834700443811122338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646026481) 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, 6094537 + ... + 6094642.

It is an arithmetic number, because the mean of its divisors is an integer number (164553930).

Almost surely, 2^646026487 is an apocalyptic number.

646026487 is a deficient number, since it is larger than the sum of its proper divisors (12189233).

646026487 is a wasteful number, since it uses less digits than its factorization.

646026487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12189232.

The product of its (nonzero) digits is 387072, while the sum is 43.

The square root of 646026487 is about 25417.0511074751. The cubic root of 646026487 is about 864.4703617262.

The spelling of 646026487 in words is "six hundred forty-six million, twenty-six thousand, four hundred eighty-seven".