81608435 has 8 divisors (see below), whose sum is σ = 98045856. Its totient is φ = 65209600.

The previous prime is 81608431. The next prime is 81608447. The reversal of 81608435 is 53480618.

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

It is not a de Polignac number, because 81608435 - 2² = 81608431 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81608395 and 81608404.

It is not an unprimeable number, because it can be changed into a prime (81608431) 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, 4766 + ... + 13635.

It is an arithmetic number, because the mean of its divisors is an integer number (12255732).

Almost surely, 2^81608435 is an apocalyptic number.

81608435 is a deficient number, since it is larger than the sum of its proper divisors (16437421).

81608435 is a wasteful number, since it uses less digits than its factorization.

81608435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19293.

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 81608435 is about 9033.7387055416. The cubic root of 81608435 is about 433.7555218038.

The spelling of 81608435 in words is "eighty-one million, six hundred eight thousand, four hundred thirty-five".