545728421 has 8 divisors (see below), whose sum is σ = 636960000. Its totient is φ = 457814448.

The previous prime is 545728411. The next prime is 545728423. The reversal of 545728421 is 124827545.

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

It is not a de Polignac number, because 545728421 - 2¹⁰ = 545727397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (545728423) 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 7 ways as a sum of consecutive naturals, for example, 829046 + ... + 829703.

It is an arithmetic number, because the mean of its divisors is an integer number (79620000).

Almost surely, 2^545728421 is an apocalyptic number.

It is an amenable number.

545728421 is a deficient number, since it is larger than the sum of its proper divisors (91231579).

545728421 is a wasteful number, since it uses less digits than its factorization.

545728421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1658803.

The product of its digits is 89600, while the sum is 38.

The square root of 545728421 is about 23360.8309141606. The cubic root of 545728421 is about 817.1946674332.

The spelling of 545728421 in words is "five hundred forty-five million, seven hundred twenty-eight thousand, four hundred twenty-one".