1018728609 has 16 divisors (see below), whose sum is σ = 1412689344. Its totient is φ = 652478400.

The previous prime is 1018728593. The next prime is 1018728649. The reversal of 1018728609 is 9068278101.

1018728609 = T₆₈₆₂ + T₆₈₆₃ + ... + T₆₉₀₄.

It is not a de Polignac number, because 1018728609 - 2⁴ = 1018728593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1018728649) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 56862 + ... + 72599.

It is an arithmetic number, because the mean of its divisors is an integer number (88293084).

Almost surely, 2^1018728609 is an apocalyptic number.

It is an amenable number.

1018728609 is a deficient number, since it is larger than the sum of its proper divisors (393960735).

1018728609 is a wasteful number, since it uses less digits than its factorization.

1018728609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129568.

The product of its (nonzero) digits is 48384, while the sum is 42.

The square root of 1018728609 is about 31917.5282407645. The cubic root of 1018728609 is about 1006.2042967604.

The spelling of 1018728609 in words is "one billion, eighteen million, seven hundred twenty-eight thousand, six hundred nine".