38685778 has 8 divisors (see below), whose sum is σ = 61442172. Its totient is φ = 18205056.

The previous prime is 38685763. The next prime is 38685809. The reversal of 38685778 is 87758683.

It can be written as a sum of positive squares in 2 ways, for example, as 37491129 + 1194649 = 6123^2 + 1093^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 568875 + ... + 568942.

Almost surely, 2^38685778 is an apocalyptic number.

38685778 is a deficient number, since it is larger than the sum of its proper divisors (22756394).

38685778 is a wasteful number, since it uses less digits than its factorization.

38685778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1137836.

The product of its digits is 2257920, while the sum is 52.

The square root of 38685778 is about 6219.7892247246. The cubic root of 38685778 is about 338.2079238397.

The spelling of 38685778 in words is "thirty-eight million, six hundred eighty-five thousand, seven hundred seventy-eight".