81264806 has 16 divisors (see below), whose sum is σ = 139636224. Its totient is φ = 34746504.

The previous prime is 81264793. The next prime is 81264809. The reversal of 81264806 is 60846218.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81264809) 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, 350 + ... + 12753.

It is an arithmetic number, because the mean of its divisors is an integer number (8727264).

Almost surely, 2^81264806 is an apocalyptic number.

81264806 is a deficient number, since it is larger than the sum of its proper divisors (58371418).

81264806 is a wasteful number, since it uses less digits than its factorization.

81264806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13555.

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 81264806 is about 9014.6994403585. The cubic root of 81264806 is about 433.1458598647.

The spelling of 81264806 in words is "eighty-one million, two hundred sixty-four thousand, eight hundred six".