649799394 has 8 divisors (see below), whose sum is σ = 1299598800. Its totient is φ = 216599796.

The previous prime is 649799387. The next prime is 649799407. The reversal of 649799394 is 493997946.

It is a sphenic number, since it is the product of 3 distinct primes.

649799394 is an admirable number.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54149944 + ... + 54149955.

It is an arithmetic number, because the mean of its divisors is an integer number (162449850).

Almost surely, 2^649799394 is an apocalyptic number.

649799394 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

649799394 is a wasteful number, since it uses less digits than its factorization.

649799394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108299904.

The product of its digits is 13226976, while the sum is 60.

The square root of 649799394 is about 25491.1630570282. The cubic root of 649799394 is about 866.1499819348.

The spelling of 649799394 in words is "six hundred forty-nine million, seven hundred ninety-nine thousand, three hundred ninety-four".