718661422728 has 36 divisors (see below), whose sum is σ = 1946394168615. Its totient is φ = 239551409808.

The previous prime is 718661422727. The next prime is 718661422741. The reversal of 718661422728 is 827224166817.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

718661422728 is a `hidden beast` number, since 7 + 18 + 6 + 614 + 2 + 2 + 7 + 2 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 359330711364 + 359330711364 = 599442^2 + 599442^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=599442.

It is a super-2 number, since 2×718661422728² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (718661422723) by changing a digit.

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 8 ways as a sum of consecutive naturals, for example, 7143351 + ... + 7243257.

Almost surely, 2^718661422728 is an apocalyptic number.

It is an amenable number.

718661422728 is an abundant number, since it is smaller than the sum of its proper divisors (1227732745887).

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

718661422728 is an frugal number, since it uses more digits than its factorization.

718661422728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199826 (or 99912 counting only the distinct ones).

The product of its digits is 3612672, while the sum is 54.

The spelling of 718661422728 in words is "seven hundred eighteen billion, six hundred sixty-one million, four hundred twenty-two thousand, seven hundred twenty-eight".