81769263 has 8 divisors (see below), whose sum is σ = 109758000. Its totient is φ = 54146688.

The previous prime is 81769249. The next prime is 81769267. The reversal of 81769263 is 36296718.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81769263 - 2⁸ = 81769007 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81769267) 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, 91018 + ... + 91911.

It is an arithmetic number, because the mean of its divisors is an integer number (13719750).

Almost surely, 2^81769263 is an apocalyptic number.

81769263 is a deficient number, since it is larger than the sum of its proper divisors (27988737).

81769263 is a wasteful number, since it uses less digits than its factorization.

81769263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183081.

The product of its digits is 108864, while the sum is 42.

The square root of 81769263 is about 9042.6358436022. The cubic root of 81769263 is about 434.0402728313.

The spelling of 81769263 in words is "eighty-one million, seven hundred sixty-nine thousand, two hundred sixty-three".