42508881 has 10 divisors (see below), whose sum is σ = 63501042. Its totient is φ = 28339200.

The previous prime is 42508861. The next prime is 42508883. The reversal of 42508881 is 18880524.

It can be written as a sum of positive squares in only one way, i.e., 42458256 + 50625 = 6516^2 + 225^2 .

It is not a de Polignac number, because 42508881 - 2¹⁵ = 42476113 is a prime.

It is a super-2 number, since 2×42508881² = 3614009927744322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (42508883) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 262320 + ... + 262481.

Almost surely, 2^42508881 is an apocalyptic number.

It is an amenable number.

42508881 is a deficient number, since it is larger than the sum of its proper divisors (20992161).

42508881 is an equidigital number, since it uses as much as digits as its factorization.

42508881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524813 (or 524804 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 36.

The square root of 42508881 is about 6519.8835112293. The cubic root of 42508881 is about 349.0009085835. Note that the first 3 decimals are identical.

It can be divided in two parts, 4250 and 8881, that added together give a palindrome (13131).

The spelling of 42508881 in words is "forty-two million, five hundred eight thousand, eight hundred eighty-one".