646867413 has 6 divisors (see below), whose sum is σ = 934364054. Its totient is φ = 431244936.

The previous prime is 646867409. The next prime is 646867423. The reversal of 646867413 is 314768646.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 344733489 + 302133924 = 18567^2 + 17382^2 .

It is not a de Polignac number, because 646867413 - 2² = 646867409 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646867423) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35937070 + ... + 35937087.

Almost surely, 2^646867413 is an apocalyptic number.

It is an amenable number.

646867413 is a deficient number, since it is larger than the sum of its proper divisors (287496641).

646867413 is a wasteful number, since it uses less digits than its factorization.

646867413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71874163 (or 71874160 counting only the distinct ones).

The product of its digits is 580608, while the sum is 45.

The square root of 646867413 is about 25433.5882839996. The cubic root of 646867413 is about 864.8452898044.

The spelling of 646867413 in words is "six hundred forty-six million, eight hundred sixty-seven thousand, four hundred thirteen".