42015720 has 64 divisors (see below), whose sum is σ = 129467520. Its totient is φ = 10900224.

The previous prime is 42015719. The next prime is 42015731. The reversal of 42015720 is 2751024.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 292 + ... + 9171.

It is an arithmetic number, because the mean of its divisors is an integer number (2022930).

Almost surely, 2^42015720 is an apocalyptic number.

42015720 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 42015720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64733760).

42015720 is an abundant number, since it is smaller than the sum of its proper divisors (87451800).

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

42015720 is a wasteful number, since it uses less digits than its factorization.

42015720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9514 (or 9510 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 42015720 is about 6481.9534092741. The cubic root of 42015720 is about 347.6460266497.

Adding to 42015720 its reverse (2751024), we get a palindrome (44766744).

The spelling of 42015720 in words is "forty-two million, fifteen thousand, seven hundred twenty".