38688681 has 16 divisors (see below), whose sum is σ = 53111808. Its totient is φ = 25040400.

The previous prime is 38688677. The next prime is 38688709. The reversal of 38688681 is 18688683.

It is a happy number.

It is not a de Polignac number, because 38688681 - 2² = 38688677 is a prime.

It is a super-2 number, since 2×38688681² = 2993628075039522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 38688681.

It is not an unprimeable number, because it can be changed into a prime (38688641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12916 + ... + 15626.

It is an arithmetic number, because the mean of its divisors is an integer number (3319488).

Almost surely, 2^38688681 is an apocalyptic number.

It is an amenable number.

38688681 is a deficient number, since it is larger than the sum of its proper divisors (14423127).

38688681 is a wasteful number, since it uses less digits than its factorization.

38688681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2852.

The product of its digits is 442368, while the sum is 48.

The square root of 38688681 is about 6220.0225883834. The cubic root of 38688681 is about 338.2163833917.

The spelling of 38688681 in words is "thirty-eight million, six hundred eighty-eight thousand, six hundred eighty-one".