81408307 has 8 divisors (see below), whose sum is σ = 84456000. Its totient is φ = 78376704.

The previous prime is 81408253. The next prime is 81408311. The reversal of 81408307 is 70380418.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81408307 - 2²³ = 73019699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81408337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6819 + ... + 14467.

It is an arithmetic number, because the mean of its divisors is an integer number (10557000).

Almost surely, 2^81408307 is an apocalyptic number.

81408307 is a deficient number, since it is larger than the sum of its proper divisors (3047693).

81408307 is a wasteful number, since it uses less digits than its factorization.

81408307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8045.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 81408307 is about 9022.6552078643. The cubic root of 81408307 is about 433.4006660000.

The spelling of 81408307 in words is "eighty-one million, four hundred eight thousand, three hundred seven".