81265706 has 12 divisors (see below), whose sum is σ = 122658882. Its totient is φ = 40380456.

The previous prime is 81265699. The next prime is 81265721. The reversal of 81265706 is 60756218.

It can be written as a sum of positive squares in only one way, i.e., 77598481 + 3667225 = 8809^2 + 1915^2 .

It is a super-2 number, since 2×81265706² = 13208229943356872, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 211991 + ... + 212373.

Almost surely, 2^81265706 is an apocalyptic number.

81265706 is a deficient number, since it is larger than the sum of its proper divisors (41393176).

81265706 is an equidigital number, since it uses as much as digits as its factorization.

81265706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1045 (or 662 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 81265706 is about 9014.7493586899. The cubic root of 81265706 is about 433.1474588752.

The spelling of 81265706 in words is "eighty-one million, two hundred sixty-five thousand, seven hundred six".