42028720 has 20 divisors (see below), whose sum is σ = 97716960. Its totient is φ = 16811456.

The previous prime is 42028717. The next prime is 42028729. The reversal of 42028720 is 2782024.

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (42028729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 262600 + ... + 262759.

It is an arithmetic number, because the mean of its divisors is an integer number (4885848).

Almost surely, 2^42028720 is an apocalyptic number.

42028720 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

42028720 is an abundant number, since it is smaller than the sum of its proper divisors (55688240).

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

42028720 is a wasteful number, since it uses less digits than its factorization.

42028720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525372 (or 525366 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 25.

The square root of 42028720 is about 6482.9561158472. The cubic root of 42028720 is about 347.6818777733.

The spelling of 42028720 in words is "forty-two million, twenty-eight thousand, seven hundred twenty".