42020028 has 36 divisors (see below), whose sum is σ = 106488928. Its totient is φ = 13970880.

The previous prime is 42020023. The next prime is 42020029. The reversal of 42020028 is 82002024.

42020028 is nontrivially palindromic in base 15.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42020023) 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, 15408 + ... + 17928.

Almost surely, 2^42020028 is an apocalyptic number.

It is an amenable number.

42020028 is an abundant number, since it is smaller than the sum of its proper divisors (64468900).

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

42020028 is a wasteful number, since it uses less digits than its factorization.

42020028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2994 (or 2989 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 42020028 is about 6482.2857079891. The cubic root of 42020028 is about 347.6579079796.

The spelling of 42020028 in words is "forty-two million, twenty thousand, twenty-eight".