646477069 has 16 divisors (see below), whose sum is σ = 764087296. Its totient is φ = 535248000.

The previous prime is 646477049. The next prime is 646477087. The reversal of 646477069 is 960774646.

It is a happy number.

It is not a de Polignac number, because 646477069 - 2⁹ = 646476557 is a prime.

It is a super-2 number, since 2×646477069² = 835865201485661522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646477049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 127939 + ... + 132895.

It is an arithmetic number, because the mean of its divisors is an integer number (47755456).

Almost surely, 2^646477069 is an apocalyptic number.

It is an amenable number.

646477069 is a deficient number, since it is larger than the sum of its proper divisors (117610227).

646477069 is a wasteful number, since it uses less digits than its factorization.

646477069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5596.

The product of its (nonzero) digits is 1524096, while the sum is 49.

The square root of 646477069 is about 25425.9133365942. The cubic root of 646477069 is about 864.6712947991.

The spelling of 646477069 in words is "six hundred forty-six million, four hundred seventy-seven thousand, sixty-nine".