816005641 has 8 divisors (see below), whose sum is σ = 890411904. Its totient is φ = 741636720.

The previous prime is 816005633. The next prime is 816005677. The reversal of 816005641 is 146500618.

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

It is not a de Polignac number, because 816005641 - 2³ = 816005633 is a prime.

It is a super-2 number, since 2×816005641² = 1331730412287641762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (816005621) 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, 56715 + ... + 69631.

It is an arithmetic number, because the mean of its divisors is an integer number (111301488).

Almost surely, 2^816005641 is an apocalyptic number.

It is an amenable number.

816005641 is a deficient number, since it is larger than the sum of its proper divisors (74406263).

816005641 is a wasteful number, since it uses less digits than its factorization.

816005641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18671.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 816005641 is about 28565.8124512502. The cubic root of 816005641 is about 934.4678989836.

The spelling of 816005641 in words is "eight hundred sixteen million, five thousand, six hundred forty-one".