649872813 has 8 divisors (see below), whose sum is σ = 868499968. Its totient is φ = 432247104.

The previous prime is 649872799. The next prime is 649872829. The reversal of 649872813 is 318278946.

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

It is not a de Polignac number, because 649872813 - 2⁵ = 649872781 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649872893) 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, 248845 + ... + 251442.

It is an arithmetic number, because the mean of its divisors is an integer number (108562496).

Almost surely, 2^649872813 is an apocalyptic number.

It is an amenable number.

649872813 is a deficient number, since it is larger than the sum of its proper divisors (218627155).

649872813 is a wasteful number, since it uses less digits than its factorization.

649872813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500723.

The product of its digits is 580608, while the sum is 48.

The square root of 649872813 is about 25492.6031036456. The cubic root of 649872813 is about 866.1826019871.

The spelling of 649872813 in words is "six hundred forty-nine million, eight hundred seventy-two thousand, eight hundred thirteen".