81600769 has 4 divisors (see below), whose sum is σ = 81655600. Its totient is φ = 81545940.

The previous prime is 81600719. The next prime is 81600781. The reversal of 81600769 is 96700618.

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.

It is a cyclic number.

It is not a de Polignac number, because 81600769 - 2¹⁷ = 81469697 is a prime.

It is a super-2 number, since 2×81600769² = 13317371002782722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81600719) 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, 25119 + ... + 28180.

It is an arithmetic number, because the mean of its divisors is an integer number (20413900).

Almost surely, 2^81600769 is an apocalyptic number.

It is an amenable number.

81600769 is a deficient number, since it is larger than the sum of its proper divisors (54831).

81600769 is a wasteful number, since it uses less digits than its factorization.

81600769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54830.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 81600769 is about 9033.3143972741. The cubic root of 81600769 is about 433.7419395723.

It can be divided in two parts, 81600 and 769, that added together give a square (82369 = 287²).

The spelling of 81600769 in words is "eighty-one million, six hundred thousand, seven hundred sixty-nine".