81368037 has 16 divisors (see below), whose sum is σ = 120706560. Its totient is φ = 54172800.

The previous prime is 81368033. The next prime is 81368047. The reversal of 81368037 is 73086318.

It is not a de Polignac number, because 81368037 - 2² = 81368033 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 81367992 and 81368010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81368033) 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, 25237 + ... + 28277.

It is an arithmetic number, because the mean of its divisors is an integer number (7544160).

Almost surely, 2^81368037 is an apocalyptic number.

It is an amenable number.

81368037 is a deficient number, since it is larger than the sum of its proper divisors (39338523).

81368037 is a wasteful number, since it uses less digits than its factorization.

81368037 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4041 (or 4035 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 81368037 is about 9020.4233270950. The cubic root of 81368037 is about 433.3291912162.

The spelling of 81368037 in words is "eighty-one million, three hundred sixty-eight thousand, thirty-seven".