42640332 has 48 divisors (see below), whose sum is σ = 119696640. Its totient is φ = 11541312.

The previous prime is 42640331. The next prime is 42640343. The reversal of 42640332 is 23304624.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (42640331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11763 + ... + 14954.

It is an arithmetic number, because the mean of its divisors is an integer number (2493680).

Almost surely, 2^42640332 is an apocalyptic number.

42640332 is a gapful number since it is divisible by the number (42) formed by its first and last digit.

It is an amenable number.

42640332 is an abundant number, since it is smaller than the sum of its proper divisors (77056308).

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

42640332 is a wasteful number, since it uses less digits than its factorization.

42640332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26750 (or 26748 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 24.

The square root of 42640332 is about 6529.9565082778. The cubic root of 42640332 is about 349.3602790661.

Adding to 42640332 its reverse (23304624), we get a palindrome (65944956).

The spelling of 42640332 in words is "forty-two million, six hundred forty thousand, three hundred thirty-two".