81387082 has 16 divisors (see below), whose sum is σ = 139753152. Its totient is φ = 34822080.

The previous prime is 81387077. The next prime is 81387083. The reversal of 81387082 is 28078318.

It is not an unprimeable number, because it can be changed into a prime (81387083) 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, 4482 + ... + 13522.

It is an arithmetic number, because the mean of its divisors is an integer number (8734572).

Almost surely, 2^81387082 is an apocalyptic number.

81387082 is a deficient number, since it is larger than the sum of its proper divisors (58366070).

81387082 is a wasteful number, since it uses less digits than its factorization.

81387082 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9693.

The product of its (nonzero) digits is 21504, while the sum is 37.

The square root of 81387082 is about 9021.4789253204. The cubic root of 81387082 is about 433.3629969174.

The spelling of 81387082 in words is "eighty-one million, three hundred eighty-seven thousand, eighty-two".