81890035 has 8 divisors (see below), whose sum is σ = 100122480. Its totient is φ = 64275744.

The previous prime is 81890021. The next prime is 81890063. The reversal of 81890035 is 53009818.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81890035 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 154245 + ... + 154774.

It is an arithmetic number, because the mean of its divisors is an integer number (12515310).

Almost surely, 2^81890035 is an apocalyptic number.

81890035 is a deficient number, since it is larger than the sum of its proper divisors (18232445).

81890035 is a wasteful number, since it uses less digits than its factorization.

81890035 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309077.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 81890035 is about 9049.3112997620. The cubic root of 81890035 is about 434.2538580802.

The spelling of 81890035 in words is "eighty-one million, eight hundred ninety thousand, thirty-five".