42808257 has 20 divisors (see below), whose sum is σ = 64306176. Its totient is φ = 28379160.

The previous prime is 42808229. The next prime is 42808277. The reversal of 42808257 is 75280824.

It is a happy number.

It is not a de Polignac number, because 42808257 - 2¹¹ = 42806209 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (42808277) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 14088 + ... + 16854.

Almost surely, 2^42808257 is an apocalyptic number.

It is an amenable number.

42808257 is a deficient number, since it is larger than the sum of its proper divisors (21497919).

42808257 is a wasteful number, since it uses less digits than its factorization.

42808257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2970 (or 2961 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 36.

The square root of 42808257 is about 6542.8019227239. The cubic root of 42808257 is about 349.8182920744.

The spelling of 42808257 in words is "forty-two million, eight hundred eight thousand, two hundred fifty-seven".