823616641 has 8 divisors (see below), whose sum is σ = 826765344. Its totient is φ = 820475040.

The previous prime is 823616603. The next prime is 823616671. The reversal of 823616641 is 146616328.

It is a happy number.

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 823616641 - 2⁷ = 823616513 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 823616641.

It is not an unprimeable number, because it can be changed into a prime (823616671) 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, 346186 + ... + 348556.

It is an arithmetic number, because the mean of its divisors is an integer number (103345668).

Almost surely, 2^823616641 is an apocalyptic number.

It is an amenable number.

823616641 is a deficient number, since it is larger than the sum of its proper divisors (3148703).

823616641 is a wasteful number, since it uses less digits than its factorization.

823616641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3551.

The product of its digits is 41472, while the sum is 37.

The square root of 823616641 is about 28698.7219401840. The cubic root of 823616641 is about 937.3642175142.

The spelling of 823616641 in words is "eight hundred twenty-three million, six hundred sixteen thousand, six hundred forty-one".