81168807 has 16 divisors (see below), whose sum is σ = 111218688. Its totient is φ = 52624320.

The previous prime is 81168749. The next prime is 81168827. The reversal of 81168807 is 70886118.

It is not a de Polignac number, because 81168807 - 2⁶ = 81168743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81168827) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46248 + ... + 47970.

It is an arithmetic number, because the mean of its divisors is an integer number (6951168).

Almost surely, 2^81168807 is an apocalyptic number.

81168807 is a deficient number, since it is larger than the sum of its proper divisors (30049881).

81168807 is a wasteful number, since it uses less digits than its factorization.

81168807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2150.

The product of its (nonzero) digits is 21504, while the sum is 39.

The square root of 81168807 is about 9009.3732856398. The cubic root of 81168807 is about 432.9752326860.

The spelling of 81168807 in words is "eighty-one million, one hundred sixty-eight thousand, eight hundred seven".