42128344 has 8 divisors (see below), whose sum is σ = 78990660. Its totient is φ = 21064168.

The previous prime is 42128257. The next prime is 42128351. The reversal of 42128344 is 44382124.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2633014 + ... + 2633029.

Almost surely, 2^42128344 is an apocalyptic number.

It is an amenable number.

42128344 is a deficient number, since it is larger than the sum of its proper divisors (36862316).

42128344 is a wasteful number, since it uses less digits than its factorization.

42128344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5266049 (or 5266045 counting only the distinct ones).

The product of its digits is 6144, while the sum is 28.

The square root of 42128344 is about 6490.6350998958. The cubic root of 42128344 is about 347.9563736212.

The spelling of 42128344 in words is "forty-two million, one hundred twenty-eight thousand, three hundred forty-four".