649728086 has 16 divisors (see below), whose sum is σ = 1117628064. Its totient is φ = 277502784.

The previous prime is 649728073. The next prime is 649728137. The reversal of 649728086 is 680827946.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75095 + ... + 83298.

It is an arithmetic number, because the mean of its divisors is an integer number (69851754).

Almost surely, 2^649728086 is an apocalyptic number.

649728086 is a deficient number, since it is larger than the sum of its proper divisors (467899978).

649728086 is a wasteful number, since it uses less digits than its factorization.

649728086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158695.

The product of its (nonzero) digits is 1161216, while the sum is 50.

The square root of 649728086 is about 25489.7643378671. The cubic root of 649728086 is about 866.1182974473.

The spelling of 649728086 in words is "six hundred forty-nine million, seven hundred twenty-eight thousand, eighty-six".