84881728 has 14 divisors (see below), whose sum is σ = 168437306. Its totient is φ = 42440832.

The previous prime is 84881717. The next prime is 84881729. The reversal of 84881728 is 82718848.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 78287104 + 6594624 = 8848^2 + 2568^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84881729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 663075 + ... + 663202.

Almost surely, 2^84881728 is an apocalyptic number.

It is an amenable number.

84881728 is a deficient number, since it is larger than the sum of its proper divisors (83555578).

84881728 is a wasteful number, since it uses less digits than its factorization.

84881728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1326289 (or 1326279 counting only the distinct ones).

The product of its digits is 229376, while the sum is 46.

The square root of 84881728 is about 9213.1280247265. The cubic root of 84881728 is about 439.4789424245.

The spelling of 84881728 in words is "eighty-four million, eight hundred eighty-one thousand, seven hundred twenty-eight".