42155028 has 72 divisors (see below), whose sum is σ = 110073600. Its totient is φ = 13597056.

The previous prime is 42155027. The next prime is 42155039. The reversal of 42155028 is 82055124.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 42154992 and 42155010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42155027) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 188925 + ... + 189147.

It is an arithmetic number, because the mean of its divisors is an integer number (1528800).

Almost surely, 2^42155028 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42155028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55036800).

42155028 is an abundant number, since it is smaller than the sum of its proper divisors (67918572).

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

42155028 is a wasteful number, since it uses less digits than its factorization.

42155028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381 (or 376 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 42155028 is about 6492.6903514645. The cubic root of 42155028 is about 348.0298230486.

The spelling of 42155028 in words is "forty-two million, one hundred fifty-five thousand, twenty-eight".