181428479285 has 8 divisors (see below), whose sum is σ = 218186442936. Its totient is φ = 144827938240.

The previous prime is 181428479261. The next prime is 181428479303. The reversal of 181428479285 is 582974824181.

It can be written as a sum of positive squares in 4 ways, for example, as 33327423364 + 148101055921 = 182558^2 + 384839^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 181428479285 - 2¹⁸ = 181428217141 is a prime.

It is a super-2 number, since 2×181428479285² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 39353114 + ... + 39357723.

It is an arithmetic number, because the mean of its divisors is an integer number (27273305367).

Almost surely, 2^181428479285 is an apocalyptic number.

It is an amenable number.

181428479285 is a deficient number, since it is larger than the sum of its proper divisors (36757963651).

181428479285 is an equidigital number, since it uses as much as digits as its factorization.

181428479285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78711303.

The product of its digits is 10321920, while the sum is 59.

The spelling of 181428479285 in words is "one hundred eighty-one billion, four hundred twenty-eight million, four hundred seventy-nine thousand, two hundred eighty-five".