81283270 has 16 divisors (see below), whose sum is σ = 146450448. Its totient is φ = 32482080.

The previous prime is 81283249. The next prime is 81283303. The reversal of 81283270 is 7238218.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 9085 + ... + 15655.

It is an arithmetic number, because the mean of its divisors is an integer number (9153153).

Almost surely, 2^81283270 is an apocalyptic number.

81283270 is a deficient number, since it is larger than the sum of its proper divisors (65167178).

81283270 is a wasteful number, since it uses less digits than its factorization.

81283270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7815.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 81283270 is about 9015.7234873303. The cubic root of 81283270 is about 433.1786620905.

The spelling of 81283270 in words is "eighty-one million, two hundred eighty-three thousand, two hundred seventy".