81028653 has 8 divisors (see below), whose sum is σ = 109869600. Its totient is φ = 53103408.

The previous prime is 81028643. The next prime is 81028691. The reversal of 81028653 is 35682018.

It is a happy number.

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

It is not a de Polignac number, because 81028653 - 2⁸ = 81028397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81028643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 228718 + ... + 229071.

It is an arithmetic number, because the mean of its divisors is an integer number (13733700).

Almost surely, 2^81028653 is an apocalyptic number.

It is an amenable number.

81028653 is a deficient number, since it is larger than the sum of its proper divisors (28840947).

81028653 is a wasteful number, since it uses less digits than its factorization.

81028653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457851.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 81028653 is about 9001.5916925842. The cubic root of 81028653 is about 432.7258833208.

The spelling of 81028653 in words is "eighty-one million, twenty-eight thousand, six hundred fifty-three".