81276738 has 8 divisors (see below), whose sum is σ = 162553488. Its totient is φ = 27092244.

The previous prime is 81276707. The next prime is 81276743. The reversal of 81276738 is 83767218.

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

81276738 is an admirable number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 81276738.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6773056 + ... + 6773067.

It is an arithmetic number, because the mean of its divisors is an integer number (20319186).

Almost surely, 2^81276738 is an apocalyptic number.

81276738 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81276738 is a wasteful number, since it uses less digits than its factorization.

81276738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13546128.

The product of its digits is 112896, while the sum is 42.

The square root of 81276738 is about 9015.3612240442. The cubic root of 81276738 is about 433.1670582314.

The spelling of 81276738 in words is "eighty-one million, two hundred seventy-six thousand, seven hundred thirty-eight".