42806090 has 16 divisors (see below), whose sum is σ = 77149800. Its totient is φ = 17100480.

The previous prime is 42806087. The next prime is 42806111. The reversal of 42806090 is 9060824.

It can be written as a sum of positive squares in 4 ways, for example, as 39526369 + 3279721 = 6287^2 + 1811^2 .

It is a super-2 number, since 2×42806090² = 3664722682176200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7136 + ... + 11684.

Almost surely, 2^42806090 is an apocalyptic number.

42806090 is a deficient number, since it is larger than the sum of its proper divisors (34343710).

42806090 is a wasteful number, since it uses less digits than its factorization.

42806090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5497.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 42806090 is about 6542.6363187938. The cubic root of 42806090 is about 349.8123892488.

The spelling of 42806090 in words is "forty-two million, eight hundred six thousand, ninety".