649578 has 8 divisors (see below), whose sum is σ = 1299168. Its totient is φ = 216524.

The previous prime is 649577. The next prime is 649613. The reversal of 649578 is 875946.

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

649578 is an admirable number.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (649573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54126 + ... + 54137.

It is an arithmetic number, because the mean of its divisors is an integer number (162396).

2⁶⁴⁹⁵⁷⁸ is an apocalyptic number.

649578 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.

649578 is a wasteful number, since it uses less digits than its factorization.

649578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108268.

The product of its digits is 60480, while the sum is 39.

The square root of 649578 is about 805.9640190480. The cubic root of 649578 is about 86.6051601730.

The spelling of 649578 in words is "six hundred forty-nine thousand, five hundred seventy-eight".