81338345 has 16 divisors (see below), whose sum is σ = 107034048. Its totient is φ = 58847040.

The previous prime is 81338339. The next prime is 81338363. The reversal of 81338345 is 54383318.

It is not a de Polignac number, because 81338345 - 2⁴ = 81338329 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7082 + ... + 14588.

It is an arithmetic number, because the mean of its divisors is an integer number (6689628).

Almost surely, 2^81338345 is an apocalyptic number.

It is an amenable number.

81338345 is a deficient number, since it is larger than the sum of its proper divisors (25695703).

81338345 is a wasteful number, since it uses less digits than its factorization.

81338345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7720.

The product of its digits is 34560, while the sum is 35.

The square root of 81338345 is about 9018.7773561609. Note that the first 3 decimals coincide. The cubic root of 81338345 is about 433.2764761036.

The spelling of 81338345 in words is "eighty-one million, three hundred thirty-eight thousand, three hundred forty-five".