128477799844 has 27 divisors (see below), whose sum is σ = 226000066593. Its totient is φ = 63908061648.

The previous prime is 128477799803. The next prime is 128477799859. The reversal of 128477799844 is 448997774821.

It is a happy number.

The square root of 128477799844 is 358438.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 22144416100 + 106333383744 = 148810^2 + 326088^2 .

It is a Smith number, since the sum of its digits (70) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 198574329 + ... + 198574975.

Almost surely, 2^128477799844 is an apocalyptic number.

128477799844 is the 358438-th square number.

It is an amenable number.

128477799844 is a deficient number, since it is larger than the sum of its proper divisors (97522266749).

128477799844 is an frugal number, since it uses more digits than its factorization.

128477799844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1852 (or 926 counting only the distinct ones).

The product of its digits is 227598336, while the sum is 70.

The spelling of 128477799844 in words is "one hundred twenty-eight billion, four hundred seventy-seven million, seven hundred ninety-nine thousand, eight hundred forty-four".