38781663 has 8 divisors (see below), whose sum is σ = 52211328. Its totient is φ = 25603224.

The previous prime is 38781649. The next prime is 38781697. The reversal of 38781663 is 36618783.

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

It is not a de Polignac number, because 38781663 - 2⁴ = 38781647 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38781643) 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, 62445 + ... + 63062.

It is an arithmetic number, because the mean of its divisors is an integer number (6526416).

Almost surely, 2^38781663 is an apocalyptic number.

38781663 is a deficient number, since it is larger than the sum of its proper divisors (13429665).

38781663 is a wasteful number, since it uses less digits than its factorization.

38781663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125613.

The product of its digits is 145152, while the sum is 42.

The square root of 38781663 is about 6227.4925130425. The cubic root of 38781663 is about 338.4871161151.

The spelling of 38781663 in words is "thirty-eight million, seven hundred eighty-one thousand, six hundred sixty-three".