81493342 has 32 divisors (see below), whose sum is σ = 151379712. Its totient is φ = 32102784.

The previous prime is 81493309. The next prime is 81493361. The reversal of 81493342 is 24339418.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a junction number, because it is equal to n+sod(n) for n = 81493298 and 81493307.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6253 + ... + 14215.

It is an arithmetic number, because the mean of its divisors is an integer number (4730616).

Almost surely, 2^81493342 is an apocalyptic number.

81493342 is a deficient number, since it is larger than the sum of its proper divisors (69886370).

81493342 is a wasteful number, since it uses less digits than its factorization.

81493342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8032.

The product of its digits is 20736, while the sum is 34.

The square root of 81493342 is about 9027.3662825876. The cubic root of 81493342 is about 433.5515162936.

The spelling of 81493342 in words is "eighty-one million, four hundred ninety-three thousand, three hundred forty-two".