649704859 has 4 divisors (see below), whose sum is σ = 649787616. Its totient is φ = 649622104.

The previous prime is 649704841. The next prime is 649704863. The reversal of 649704859 is 958407946.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-649704859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649704959) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28204 + ... + 45769.

It is an arithmetic number, because the mean of its divisors is an integer number (162446904).

Almost surely, 2^649704859 is an apocalyptic number.

649704859 is a deficient number, since it is larger than the sum of its proper divisors (82757).

649704859 is an equidigital number, since it uses as much as digits as its factorization.

649704859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82756.

The product of its (nonzero) digits is 2177280, while the sum is 52.

The square root of 649704859 is about 25489.3087195396. The cubic root of 649704859 is about 866.1079764275.

The spelling of 649704859 in words is "six hundred forty-nine million, seven hundred four thousand, eight hundred fifty-nine".