42528321 has 40 divisors (see below), whose sum is σ = 70567200. Its totient is φ = 25306560.

The previous prime is 42528319. The next prime is 42528329. The reversal of 42528321 is 12382524.

It is not a de Polignac number, because 42528321 - 2¹ = 42528319 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42528329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 52165 + ... + 52973.

It is an arithmetic number, because the mean of its divisors is an integer number (1764180).

Almost surely, 2^42528321 is an apocalyptic number.

It is an amenable number.

42528321 is a deficient number, since it is larger than the sum of its proper divisors (28038879).

42528321 is a wasteful number, since it uses less digits than its factorization.

42528321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 891 (or 882 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 42528321 is about 6521.3741650054. The cubic root of 42528321 is about 349.0541017323.

It can be divided in two parts, 42528 and 321, that added together give a square (42849 = 207²).

The spelling of 42528321 in words is "forty-two million, five hundred twenty-eight thousand, three hundred twenty-one".