81337474 has 8 divisors (see below), whose sum is σ = 122093568. Its totient is φ = 40639620.

The previous prime is 81337411. The next prime is 81337511. The reversal of 81337474 is 47473318.

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

It is a super-3 number, since 3×81337474³ (a number of 25 digits) contains 333 as substring.

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, 10882 + ... + 16765.

It is an arithmetic number, because the mean of its divisors is an integer number (15261696).

Almost surely, 2^81337474 is an apocalyptic number.

81337474 is a deficient number, since it is larger than the sum of its proper divisors (40756094).

81337474 is a wasteful number, since it uses less digits than its factorization.

81337474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29120.

The product of its digits is 56448, while the sum is 37.

The square root of 81337474 is about 9018.7290678898. The cubic root of 81337474 is about 433.2749295384.

The spelling of 81337474 in words is "eighty-one million, three hundred thirty-seven thousand, four hundred seventy-four".