81769012 has 24 divisors (see below), whose sum is σ = 154374696. Its totient is φ = 37673088.

The previous prime is 81769007. The next prime is 81769043. The reversal of 81769012 is 21096718.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 119716 + 81649296 = 346^2 + 9036^2 .

It is a super-2 number, since 2×81769012² = 13372342646912288, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40458 + ... + 42430.

It is an arithmetic number, because the mean of its divisors is an integer number (6432279).

Almost surely, 2^81769012 is an apocalyptic number.

It is an amenable number.

81769012 is a deficient number, since it is larger than the sum of its proper divisors (72605684).

81769012 is a wasteful number, since it uses less digits than its factorization.

81769012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2787 (or 2785 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 81769012 is about 9042.6219648949. The cubic root of 81769012 is about 434.0398287189.

The spelling of 81769012 in words is "eighty-one million, seven hundred sixty-nine thousand, twelve".