81136038 has 16 divisors (see below), whose sum is σ = 163946160. Its totient is φ = 26766336.

The previous prime is 81136037. The next prime is 81136051. The reversal of 81136038 is 83063118.

It is a junction number, because it is equal to n+sod(n) for n = 81135996 and 81136014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81136037) 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, 69123 + ... + 70286.

It is an arithmetic number, because the mean of its divisors is an integer number (10246635).

Almost surely, 2^81136038 is an apocalyptic number.

81136038 is an abundant number, since it is smaller than the sum of its proper divisors (82810122).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81136038 is a wasteful number, since it uses less digits than its factorization.

81136038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139511.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 81136038 is about 9007.5544960883. The cubic root of 81136038 is about 432.9169587600.

The spelling of 81136038 in words is "eighty-one million, one hundred thirty-six thousand, thirty-eight".