646689417 has 16 divisors (see below), whose sum is σ = 942701760. Its totient is φ = 391073600.

The previous prime is 646689391. The next prime is 646689431. The reversal of 646689417 is 714986646.

It is a cyclic number.

It is not a de Polignac number, because 646689417 - 2⁸ = 646689161 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 646689417.

It is not an unprimeable number, because it can be changed into a prime (646689467) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6042 + ... + 36467.

It is an arithmetic number, because the mean of its divisors is an integer number (58918860).

Almost surely, 2^646689417 is an apocalyptic number.

It is an amenable number.

646689417 is a deficient number, since it is larger than the sum of its proper divisors (296012343).

646689417 is a wasteful number, since it uses less digits than its factorization.

646689417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42984.

The product of its digits is 1741824, while the sum is 51.

The square root of 646689417 is about 25430.0888122712. The cubic root of 646689417 is about 864.7659571515.

The spelling of 646689417 in words is "six hundred forty-six million, six hundred eighty-nine thousand, four hundred seventeen".