649780206 has 32 divisors (see below), whose sum is σ = 1347027840. Its totient is φ = 208711776.

The previous prime is 649780193. The next prime is 649780213. The reversal of 649780206 is 602087946.

It is a super-2 number, since 2×649780206² = 844428632218804872, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91765 + ... + 98591.

It is an arithmetic number, because the mean of its divisors is an integer number (42094620).

Almost surely, 2^649780206 is an apocalyptic number.

649780206 is an abundant number, since it is smaller than the sum of its proper divisors (697247634).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

649780206 is a wasteful number, since it uses less digits than its factorization.

649780206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7408.

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 649780206 is about 25490.7866885273. The cubic root of 649780206 is about 866.1414563039.

The spelling of 649780206 in words is "six hundred forty-nine million, seven hundred eighty thousand, two hundred six".