81793760 has 24 divisors (see below), whose sum is σ = 193238136. Its totient is φ = 32717440.

The previous prime is 81793721. The next prime is 81793769. The reversal of 81793760 is 6739718.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81793769) 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, 255446 + ... + 255765.

It is an arithmetic number, because the mean of its divisors is an integer number (8051589).

Almost surely, 2^81793760 is an apocalyptic number.

81793760 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81793760 is an abundant number, since it is smaller than the sum of its proper divisors (111444376).

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

81793760 is a wasteful number, since it uses less digits than its factorization.

81793760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511226 (or 511218 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 41.

The square root of 81793760 is about 9043.9902697869. The cubic root of 81793760 is about 434.0836127634.

The spelling of 81793760 in words is "eighty-one million, seven hundred ninety-three thousand, seven hundred sixty".