81755942 has 8 divisors (see below), whose sum is σ = 123034296. Its totient is φ = 40744512.

The previous prime is 81755939. The next prime is 81755953. The reversal of 81755942 is 24955718.

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

It is a self number, because there is not a number n which added to its sum of digits gives 81755942.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65963 + ... + 67190.

It is an arithmetic number, because the mean of its divisors is an integer number (15379287).

Almost surely, 2^81755942 is an apocalyptic number.

81755942 is a deficient number, since it is larger than the sum of its proper divisors (41278354).

81755942 is a wasteful number, since it uses less digits than its factorization.

81755942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133462.

The product of its digits is 100800, while the sum is 41.

The square root of 81755942 is about 9041.8992473927. The cubic root of 81755942 is about 434.0167017718.

The spelling of 81755942 in words is "eighty-one million, seven hundred fifty-five thousand, nine hundred forty-two".