42745281 has 8 divisors (see below), whose sum is σ = 57581664. Its totient is φ = 28202880.

The previous prime is 42745277. The next prime is 42745289. The reversal of 42745281 is 18254724.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42745281 - 2² = 42745277 is a prime.

It is a super-2 number, since 2×42745281² = 3654318095537922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (42745289) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73155 + ... + 73736.

It is an arithmetic number, because the mean of its divisors is an integer number (7197708).

Almost surely, 2^42745281 is an apocalyptic number.

It is an amenable number.

42745281 is a deficient number, since it is larger than the sum of its proper divisors (14836383).

42745281 is a wasteful number, since it uses less digits than its factorization.

42745281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146991.

The product of its digits is 17920, while the sum is 33.

The square root of 42745281 is about 6537.9875344023. The cubic root of 42745281 is about 349.6466665506.

The spelling of 42745281 in words is "forty-two million, seven hundred forty-five thousand, two hundred eighty-one".