81826769 has 4 divisors (see below), whose sum is σ = 81885696. Its totient is φ = 81767844.

The previous prime is 81826757. The next prime is 81826783. The reversal of 81826769 is 96762818.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 96762818 = 2 ⋅48381409.

It is a cyclic number.

It is not a de Polignac number, because 81826769 - 2⁸ = 81826513 is a prime.

It is a super-2 number, since 2×81826769² = 13391240249958722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81826799) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27329 + ... + 30174.

It is an arithmetic number, because the mean of its divisors is an integer number (20471424).

Almost surely, 2^81826769 is an apocalyptic number.

It is an amenable number.

81826769 is a deficient number, since it is larger than the sum of its proper divisors (58927).

81826769 is a wasteful number, since it uses less digits than its factorization.

81826769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58926.

The product of its digits is 290304, while the sum is 47.

The square root of 81826769 is about 9045.8149992137. The cubic root of 81826769 is about 434.1419983864.

The spelling of 81826769 in words is "eighty-one million, eight hundred twenty-six thousand, seven hundred sixty-nine".