649215685 has 8 divisors (see below), whose sum is σ = 783138816. Its totient is φ = 516652560.

The previous prime is 649215659. The next prime is 649215691. The reversal of 649215685 is 586512946.

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

It is not a de Polignac number, because 649215685 - 2¹⁵ = 649182917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 338949 + ... + 340858.

It is an arithmetic number, because the mean of its divisors is an integer number (97892352).

Almost surely, 2^649215685 is an apocalyptic number.

It is an amenable number.

649215685 is a deficient number, since it is larger than the sum of its proper divisors (133923131).

649215685 is a wasteful number, since it uses less digits than its factorization.

649215685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 680003.

The product of its digits is 518400, while the sum is 46.

The square root of 649215685 is about 25479.7112424768. The cubic root of 649215685 is about 865.8905526371.

The spelling of 649215685 in words is "six hundred forty-nine million, two hundred fifteen thousand, six hundred eighty-five".