816669580 has 96 divisors (see below), whose sum is σ = 1868106240. Its totient is φ = 299120640.

The previous prime is 816669577. The next prime is 816669629. The reversal of 816669580 is 85966618.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 952512 + ... + 953368.

It is an arithmetic number, because the mean of its divisors is an integer number (19459440).

Almost surely, 2^816669580 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 816669580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (934053120).

816669580 is an abundant number, since it is smaller than the sum of its proper divisors (1051436660).

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

816669580 is a wasteful number, since it uses less digits than its factorization.

816669580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 979 (or 977 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 49.

The square root of 816669580 is about 28577.4313051401. The cubic root of 816669580 is about 934.7212720231.

The spelling of 816669580 in words is "eight hundred sixteen million, six hundred sixty-nine thousand, five hundred eighty".