42640052 has 36 divisors (see below), whose sum is σ = 92354976. Its totient is φ = 16866720.

The previous prime is 42640051. The next prime is 42640061. The reversal of 42640052 is 25004624.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42640051) 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 11 ways as a sum of consecutive naturals, for example, 227 + ... + 9237.

It is an arithmetic number, because the mean of its divisors is an integer number (2565416).

Almost surely, 2^42640052 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42640052, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46177488).

42640052 is an abundant number, since it is smaller than the sum of its proper divisors (49714924).

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

42640052 is a wasteful number, since it uses less digits than its factorization.

42640052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9048 (or 9033 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 42640052 is about 6529.9350685899. The cubic root of 42640052 is about 349.3595143668.

Adding to 42640052 its reverse (25004624), we get a palindrome (67644676).

The spelling of 42640052 in words is "forty-two million, six hundred forty thousand, fifty-two".