42004640 has 48 divisors (see below), whose sum is σ = 100463328. Its totient is φ = 16594176.

The previous prime is 42004639. The next prime is 42004663. The reversal of 42004640 is 4640024.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a zygodrome in base 4.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11699 + ... + 14861.

It is an arithmetic number, because the mean of its divisors is an integer number (2092986).

Almost surely, 2^42004640 is an apocalyptic number.

42004640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42004640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50231664).

42004640 is an abundant number, since it is smaller than the sum of its proper divisors (58458688).

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

42004640 is a wasteful number, since it uses less digits than its factorization.

42004640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3261 (or 3253 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 42004640 is about 6481.0986722931. The cubic root of 42004640 is about 347.6154646233.

Adding to 42004640 its reverse (4640024), we get a palindrome (46644664).

The spelling of 42004640 in words is "forty-two million, four thousand, six hundred forty".