81380014 has 4 divisors (see below), whose sum is σ = 122070024. Its totient is φ = 40690006.

The previous prime is 81380011. The next prime is 81380029. The reversal of 81380014 is 41008318.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81380011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20345002 + ... + 20345005.

It is an arithmetic number, because the mean of its divisors is an integer number (30517506).

Almost surely, 2^81380014 is an apocalyptic number.

81380014 is a deficient number, since it is larger than the sum of its proper divisors (40690010).

81380014 is a wasteful number, since it uses less digits than its factorization.

81380014 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40690009.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 81380014 is about 9021.0871850349. The cubic root of 81380014 is about 433.3504515263.

The spelling of 81380014 in words is "eighty-one million, three hundred eighty thousand, fourteen".