81484728 has 32 divisors (see below), whose sum is σ = 219382800. Its totient is φ = 25072128.

The previous prime is 81484721. The next prime is 81484747. The reversal of 81484728 is 82748418.

It is a self number, because there is not a number n which added to its sum of digits gives 81484728.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81484721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130273 + ... + 130896.

Almost surely, 2^81484728 is an apocalyptic number.

It is an amenable number.

81484728 is an abundant number, since it is smaller than the sum of its proper divisors (137898072).

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

81484728 is a wasteful number, since it uses less digits than its factorization.

81484728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261191 (or 261187 counting only the distinct ones).

The product of its digits is 114688, while the sum is 42.

The square root of 81484728 is about 9026.8891651554. The cubic root of 81484728 is about 433.5362400176.

The spelling of 81484728 in words is "eighty-one million, four hundred eighty-four thousand, seven hundred twenty-eight".