81368607 has 8 divisors (see below), whose sum is σ = 109054384. Its totient is φ = 53964288.

The previous prime is 81368593. The next prime is 81368653. The reversal of 81368607 is 70686318.

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

It is not a de Polignac number, because 81368607 - 2⁴ = 81368591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81368207) 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, 69688 + ... + 70845.

It is an arithmetic number, because the mean of its divisors is an integer number (13631798).

Almost surely, 2^81368607 is an apocalyptic number.

81368607 is a deficient number, since it is larger than the sum of its proper divisors (27685777).

81368607 is a wasteful number, since it uses less digits than its factorization.

81368607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140729.

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 81368607 is about 9020.4549220092. The cubic root of 81368607 is about 433.3302030675.

The spelling of 81368607 in words is "eighty-one million, three hundred sixty-eight thousand, six hundred seven".