81283274 has 8 divisors (see below), whose sum is σ = 123108960. Its totient is φ = 40246956.

The previous prime is 81283249. The next prime is 81283303. The reversal of 81283274 is 47238218.

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

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197084 + ... + 197495.

It is an arithmetic number, because the mean of its divisors is an integer number (15388620).

Almost surely, 2^81283274 is an apocalyptic number.

81283274 is a deficient number, since it is larger than the sum of its proper divisors (41825686).

81283274 is a wasteful number, since it uses less digits than its factorization.

81283274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394684.

The product of its digits is 21504, while the sum is 35.

The square root of 81283274 is about 9015.7237091650. The cubic root of 81283274 is about 433.1786691961.

The spelling of 81283274 in words is "eighty-one million, two hundred eighty-three thousand, two hundred seventy-four".