81269707 has 8 divisors (see below), whose sum is σ = 90579600. Its totient is φ = 72463104.

The previous prime is 81269689. The next prime is 81269717. The reversal of 81269707 is 70796218.

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 81269707 - 2⁷ = 81269579 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81269707.

It is not an unprimeable number, because it can be changed into a prime (81269717) 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, 125482 + ... + 126127.

It is an arithmetic number, because the mean of its divisors is an integer number (11322450).

Almost surely, 2^81269707 is an apocalyptic number.

81269707 is a deficient number, since it is larger than the sum of its proper divisors (9309893).

81269707 is a wasteful number, since it uses less digits than its factorization.

81269707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251645.

The product of its (nonzero) digits is 42336, while the sum is 40.

The square root of 81269707 is about 9014.9712700596. The cubic root of 81269707 is about 433.1545672224.

The spelling of 81269707 in words is "eighty-one million, two hundred sixty-nine thousand, seven hundred seven".