81769260 has 48 divisors (see below), whose sum is σ = 235148256. Its totient is φ = 21215232.

The previous prime is 81769249. The next prime is 81769267. The reversal of 81769260 is 6296718.

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 15 ways as a sum of consecutive naturals, for example, 16197 + ... + 20636.

It is an arithmetic number, because the mean of its divisors is an integer number (4898922).

Almost surely, 2^81769260 is an apocalyptic number.

It is an amenable number.

81769260 is an abundant number, since it is smaller than the sum of its proper divisors (153378996).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81769260 is a wasteful number, since it uses less digits than its factorization.

81769260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36882 (or 36880 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 81769260 is about 9042.6356777214. The cubic root of 81769260 is about 434.0402675232.

The spelling of 81769260 in words is "eighty-one million, seven hundred sixty-nine thousand, two hundred sixty".