81343028 has 96 divisors (see below), whose sum is σ = 177811200. Its totient is φ = 32126976.

The previous prime is 81343021. The next prime is 81343033. The reversal of 81343028 is 82034318.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81343021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 487001 + ... + 487167.

It is an arithmetic number, because the mean of its divisors is an integer number (1852200).

Almost surely, 2^81343028 is an apocalyptic number.

It is an amenable number.

81343028 is an abundant number, since it is smaller than the sum of its proper divisors (96468172).

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

81343028 is a wasteful number, since it uses less digits than its factorization.

81343028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249 (or 247 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 81343028 is about 9019.0369774162. The cubic root of 81343028 is about 433.2847911437.

The spelling of 81343028 in words is "eighty-one million, three hundred forty-three thousand, twenty-eight".