81032769 has 24 divisors (see below), whose sum is σ = 122714592. Its totient is φ = 51468480.

The previous prime is 81032759. The next prime is 81032771. The reversal of 81032769 is 96723018.

It is not a de Polignac number, because 81032769 - 2¹⁵ = 81000001 is a prime.

It is a super-2 number, since 2×81032769² = 13132619303614722, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (81032719) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13314 + ... + 18420.

It is an arithmetic number, because the mean of its divisors is an integer number (5113108).

Almost surely, 2^81032769 is an apocalyptic number.

It is an amenable number.

81032769 is a deficient number, since it is larger than the sum of its proper divisors (41681823).

81032769 is a wasteful number, since it uses less digits than its factorization.

81032769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5197 (or 5194 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 81032769 is about 9001.8203159139. The cubic root of 81032769 is about 432.7332102334.

The spelling of 81032769 in words is "eighty-one million, thirty-two thousand, seven hundred sixty-nine".