64798409 has 16 divisors (see below), whose sum is σ = 72693264. Its totient is φ = 57369600.

The previous prime is 64798369. The next prime is 64798421. The reversal of 64798409 is 90489746.

It can be written as a sum of positive squares in 8 ways, for example, as 24285184 + 40513225 = 4928^2 + 6365^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64798409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64798439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31517 + ... + 33509.

It is an arithmetic number, because the mean of its divisors is an integer number (4543329).

Almost surely, 2^64798409 is an apocalyptic number.

It is an amenable number.

64798409 is a deficient number, since it is larger than the sum of its proper divisors (7894855).

64798409 is a wasteful number, since it uses less digits than its factorization.

64798409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2108.

The product of its (nonzero) digits is 435456, while the sum is 47.

The square root of 64798409 is about 8049.7458966107. The cubic root of 64798409 is about 401.6564827760.

The spelling of 64798409 in words is "sixty-four million, seven hundred ninety-eight thousand, four hundred nine".