81350769 has 8 divisors (see below), whose sum is σ = 108516672. Its totient is φ = 54209360.

The previous prime is 81350767. The next prime is 81350777. The reversal of 81350769 is 96705318.

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 81350769 - 2¹ = 81350767 is a prime.

It is a super-2 number, since 2×81350769² = 13235895233782722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81350767) 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, 4039 + ... + 13379.

It is an arithmetic number, because the mean of its divisors is an integer number (13564584).

Almost surely, 2^81350769 is an apocalyptic number.

It is an amenable number.

81350769 is a deficient number, since it is larger than the sum of its proper divisors (27165903).

81350769 is a wasteful number, since it uses less digits than its factorization.

81350769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12247.

The product of its (nonzero) digits is 45360, while the sum is 39.

The square root of 81350769 is about 9019.4661150203. The cubic root of 81350769 is about 433.2985352070.

The spelling of 81350769 in words is "eighty-one million, three hundred fifty thousand, seven hundred sixty-nine".