81463274 has 4 divisors (see below), whose sum is σ = 122194914. Its totient is φ = 40731636.

The previous prime is 81463271. The next prime is 81463297. The reversal of 81463274 is 47236418.

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

It can be written as a sum of positive squares in only one way, i.e., 72505225 + 8958049 = 8515^2 + 2993^2 .

It is not an unprimeable number, because it can be changed into a prime (81463271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20365817 + ... + 20365820.

Almost surely, 2^81463274 is an apocalyptic number.

81463274 is a deficient number, since it is larger than the sum of its proper divisors (40731640).

81463274 is a wasteful number, since it uses less digits than its factorization.

81463274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40731639.

The product of its digits is 32256, while the sum is 35.

The square root of 81463274 is about 9025.7007484184. The cubic root of 81463274 is about 433.4981882946.

The spelling of 81463274 in words is "eighty-one million, four hundred sixty-three thousand, two hundred seventy-four".