81347342 has 4 divisors (see below), whose sum is σ = 122021016. Its totient is φ = 40673670.

The previous prime is 81347339. The next prime is 81347347. The reversal of 81347342 is 24374318.

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

It is a junction number, because it is equal to n+sod(n) for n = 81347299 and 81347308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81347347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20336834 + ... + 20336837.

It is an arithmetic number, because the mean of its divisors is an integer number (30505254).

Almost surely, 2^81347342 is an apocalyptic number.

81347342 is a deficient number, since it is larger than the sum of its proper divisors (40673674).

81347342 is a wasteful number, since it uses less digits than its factorization.

81347342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40673673.

The product of its digits is 16128, while the sum is 32.

The square root of 81347342 is about 9019.2761350343. The cubic root of 81347342 is about 433.2924507124.

The spelling of 81347342 in words is "eighty-one million, three hundred forty-seven thousand, three hundred forty-two".