42828981 has 16 divisors (see below), whose sum is σ = 62280960. Its totient is φ = 26020800.

The previous prime is 42828977. The next prime is 42829019. The reversal of 42828981 is 18982824.

It is not a de Polignac number, because 42828981 - 2² = 42828977 is a prime.

It is a super-2 number, since 2×42828981² = 3668643226996722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42828971) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3870 + ... + 10031.

It is an arithmetic number, because the mean of its divisors is an integer number (3892560).

Almost surely, 2^42828981 is an apocalyptic number.

It is an amenable number.

42828981 is a deficient number, since it is larger than the sum of its proper divisors (19451979).

42828981 is a wasteful number, since it uses less digits than its factorization.

42828981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13996.

The product of its digits is 73728, while the sum is 42.

The square root of 42828981 is about 6544.3854562518. The cubic root of 42828981 is about 349.8747334032.

The spelling of 42828981 in words is "forty-two million, eight hundred twenty-eight thousand, nine hundred eighty-one".