81748286 has 8 divisors (see below), whose sum is σ = 122943744. Its totient is φ = 40767040.

The previous prime is 81748273. The next prime is 81748309. The reversal of 81748286 is 68284718.

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

It is a congruent number.

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, 52595 + ... + 54126.

It is an arithmetic number, because the mean of its divisors is an integer number (15367968).

Almost surely, 2^81748286 is an apocalyptic number.

81748286 is a deficient number, since it is larger than the sum of its proper divisors (41195458).

81748286 is a wasteful number, since it uses less digits than its factorization.

81748286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107106.

The product of its digits is 172032, while the sum is 44.

The square root of 81748286 is about 9041.4758750992. The cubic root of 81748286 is about 434.0031535798.

The spelling of 81748286 in words is "eighty-one million, seven hundred forty-eight thousand, two hundred eighty-six".