81028635 has 16 divisors (see below), whose sum is σ = 136469760. Its totient is φ = 40940640.

The previous prime is 81028627. The next prime is 81028643. The reversal of 81028635 is 53682018.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (81028627) and next prime (81028643).

It is not a de Polignac number, because 81028635 - 2³ = 81028627 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81028596 and 81028605.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 141871 + ... + 142440.

It is an arithmetic number, because the mean of its divisors is an integer number (8529360).

Almost surely, 2^81028635 is an apocalyptic number.

81028635 is a deficient number, since it is larger than the sum of its proper divisors (55441125).

81028635 is a wasteful number, since it uses less digits than its factorization.

81028635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284338.

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

The square root of 81028635 is about 9001.5906927609. The cubic root of 81028635 is about 432.7258512784.

The spelling of 81028635 in words is "eighty-one million, twenty-eight thousand, six hundred thirty-five".