816969660 has 288 divisors, whose sum is σ = 2691698688. Its totient is φ = 184504320.

The previous prime is 816969653. The next prime is 816969661. The reversal of 816969660 is 66969618.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816969661) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 7229764 + ... + 7229876.

It is an arithmetic number, because the mean of its divisors is an integer number (9346176).

Almost surely, 2^816969660 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 816969660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1345849344).

816969660 is an abundant number, since it is smaller than the sum of its proper divisors (1874729028).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

816969660 is a wasteful number, since it uses less digits than its factorization.

816969660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205 (or 190 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 51.

The square root of 816969660 is about 28582.6811198670. The cubic root of 816969660 is about 934.8357437827.

The spelling of 816969660 in words is "eight hundred sixteen million, nine hundred sixty-nine thousand, six hundred sixty".