81340635 has 8 divisors (see below), whose sum is σ = 130145040. Its totient is φ = 43381664.

The previous prime is 81340619. The next prime is 81340657. The reversal of 81340635 is 53604318.

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

It is a cyclic number.

It is not a de Polignac number, because 81340635 - 2⁴ = 81340619 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, 2711340 + ... + 2711369.

It is an arithmetic number, because the mean of its divisors is an integer number (16268130).

Almost surely, 2^81340635 is an apocalyptic number.

81340635 is a deficient number, since it is larger than the sum of its proper divisors (48804405).

81340635 is a wasteful number, since it uses less digits than its factorization.

81340635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5422717.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 81340635 is about 9018.9043126092. The cubic root of 81340635 is about 433.2805422212.

The spelling of 81340635 in words is "eighty-one million, three hundred forty thousand, six hundred thirty-five".