42758281 has 4 divisors (see below), whose sum is σ = 45273492. Its totient is φ = 40243072.

The previous prime is 42758239. The next prime is 42758293. The reversal of 42758281 is 18285724.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25160256 + 17598025 = 5016^2 + 4195^2 .

It is a cyclic number.

It is not a de Polignac number, because 42758281 - 2⁷ = 42758153 is a prime.

It is a super-2 number, since 2×42758281² = 3656541188149922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42758281.

It is not an unprimeable number, because it can be changed into a prime (42758201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1257580 + ... + 1257613.

It is an arithmetic number, because the mean of its divisors is an integer number (11318373).

Almost surely, 2^42758281 is an apocalyptic number.

It is an amenable number.

42758281 is a deficient number, since it is larger than the sum of its proper divisors (2515211).

42758281 is a wasteful number, since it uses less digits than its factorization.

42758281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2515210.

The product of its digits is 35840, while the sum is 37.

The square root of 42758281 is about 6538.9816485444. The cubic root of 42758281 is about 349.6821086380.

The spelling of 42758281 in words is "forty-two million, seven hundred fifty-eight thousand, two hundred eighty-one".