42000028 has 24 divisors (see below), whose sum is σ = 84182112. Its totient is φ = 17961024.

The previous prime is 42000019. The next prime is 42000029. The reversal of 42000028 is 82000024.

It is a junction number, because it is equal to n+sod(n) for n = 41999975 and 42000020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42000029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14250 + ... + 16942.

It is an arithmetic number, because the mean of its divisors is an integer number (3507588).

Almost surely, 2^42000028 is an apocalyptic number.

It is an amenable number.

42000028 is an abundant number, since it is smaller than the sum of its proper divisors (42182084).

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

42000028 is a wasteful number, since it uses less digits than its factorization.

42000028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3261 (or 3259 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 42000028 is about 6480.7428586544. The cubic root of 42000028 is about 347.6027417337.

The spelling of 42000028 in words is "forty-two million, twenty-eight", and thus it is an aban number and an uban number.