81429458 has 8 divisors (see below), whose sum is σ = 133248240. Its totient is φ = 37013380.

The previous prime is 81429443. The next prime is 81429503. The reversal of 81429458 is 85492418.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1850648 + ... + 1850691.

It is an arithmetic number, because the mean of its divisors is an integer number (16656030).

Almost surely, 2^81429458 is an apocalyptic number.

81429458 is a deficient number, since it is larger than the sum of its proper divisors (51818782).

81429458 is a wasteful number, since it uses less digits than its factorization.

81429458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3701352.

The product of its digits is 92160, while the sum is 41.

The square root of 81429458 is about 9023.8272368214. The cubic root of 81429458 is about 433.4381972383.

The spelling of 81429458 in words is "eighty-one million, four hundred twenty-nine thousand, four hundred fifty-eight".