649579 has 8 divisors (see below), whose sum is σ = 753408. Its totient is φ = 548520.

The previous prime is 649577. The next prime is 649613. The reversal of 649579 is 975946.

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

It is not a de Polignac number, because 649579 - 2¹ = 649577 is a prime.

It is a Duffinian number.

649579 is a lucky number.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157 + ... + 1150.

It is an arithmetic number, because the mean of its divisors is an integer number (94176).

2⁶⁴⁹⁵⁷⁹ is an apocalyptic number.

649579 is a deficient number, since it is larger than the sum of its proper divisors (103829).

649579 is a wasteful number, since it uses less digits than its factorization.

649579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1385.

The product of its digits is 68040, while the sum is 40.

The square root of 649579 is about 805.9646394228. The cubic root of 649579 is about 86.6052046148.

The spelling of 649579 in words is "six hundred forty-nine thousand, five hundred seventy-nine".