81755342 has 4 divisors (see below), whose sum is σ = 122633016. Its totient is φ = 40877670.

The previous prime is 81755281. The next prime is 81755357. The reversal of 81755342 is 24355718.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20438834 + ... + 20438837.

It is an arithmetic number, because the mean of its divisors is an integer number (30658254).

Almost surely, 2^81755342 is an apocalyptic number.

81755342 is a deficient number, since it is larger than the sum of its proper divisors (40877674).

81755342 is a wasteful number, since it uses less digits than its factorization.

81755342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40877673.

The product of its digits is 33600, while the sum is 35.

The square root of 81755342 is about 9041.8660684618. The cubic root of 81755342 is about 434.0156400318.

The spelling of 81755342 in words is "eighty-one million, seven hundred fifty-five thousand, three hundred forty-two".