816560 has 40 divisors (see below), whose sum is σ = 1941840. Its totient is φ = 319232.

The previous prime is 816559. The next prime is 816581. The reversal of 816560 is 65618.

816560 = T₁₀₁ + T₁₀₂ + ... + T₁₈₀.

816560 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-3 number, since 3×816560³ = 1633373705845248000, which contains 333 as substring.

It is a plaindrome in base 12.

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, 4634 + ... + 4806.

It is an arithmetic number, because the mean of its divisors is an integer number (48546).

2⁸¹⁶⁵⁶⁰ is an apocalyptic number.

816560 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 816560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (970920).

816560 is an abundant number, since it is smaller than the sum of its proper divisors (1125280).

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

816560 is a wasteful number, since it uses less digits than its factorization.

816560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245 (or 239 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 816560 is about 903.6370952988. The cubic root of 816560 is about 93.4679463463.

The spelling of 816560 in words is "eight hundred sixteen thousand, five hundred sixty".