37968681 has 4 divisors (see below), whose sum is σ = 50624912. Its totient is φ = 25312452.

The previous prime is 37968661. The next prime is 37968691. The reversal of 37968681 is 18686973.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18686973 = 3 ⋅6228991.

It is not a de Polignac number, because 37968681 - 2¹⁴ = 37952297 is a prime.

It is a super-2 number, since 2×37968681² = 2883241473759522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 37968681.

It is not an unprimeable number, because it can be changed into a prime (37968611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6328111 + ... + 6328116.

It is an arithmetic number, because the mean of its divisors is an integer number (12656228).

Almost surely, 2^37968681 is an apocalyptic number.

It is an amenable number.

37968681 is a deficient number, since it is larger than the sum of its proper divisors (12656231).

37968681 is a wasteful number, since it uses less digits than its factorization.

37968681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12656230.

The product of its digits is 435456, while the sum is 48.

The square root of 37968681 is about 6161.8731729889. The cubic root of 37968681 is about 336.1051523920.

The spelling of 37968681 in words is "thirty-seven million, nine hundred sixty-eight thousand, six hundred eighty-one".