728705840618 has 32 divisors (see below), whose sum is σ = 1258433863680. Its totient is φ = 309997387440.

The previous prime is 728705840587. The next prime is 728705840623. The reversal of 728705840618 is 816048507827.

It is a super-5 number, since 5×728705840618⁵ (a number of 61 digits) contains 55555 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11236955 + ... + 11301617.

It is an arithmetic number, because the mean of its divisors is an integer number (39326058240).

Almost surely, 2^728705840618 is an apocalyptic number.

728705840618 is a deficient number, since it is larger than the sum of its proper divisors (529728023062).

728705840618 is a wasteful number, since it uses less digits than its factorization.

728705840618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70602.

The product of its (nonzero) digits is 6021120, while the sum is 56.

The spelling of 728705840618 in words is "seven hundred twenty-eight billion, seven hundred five million, eight hundred forty thousand, six hundred eighteen".