816870 has 32 divisors (see below), whose sum is σ = 1992672. Its totient is φ = 214272.

The previous prime is 816869. The next prime is 816883. The reversal of 816870 is 78618.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2004 + ... + 2376.

It is an arithmetic number, because the mean of its divisors is an integer number (62271).

2⁸¹⁶⁸⁷⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 816870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (996336).

816870 is an abundant number, since it is smaller than the sum of its proper divisors (1175802).

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

816870 is a wasteful number, since it uses less digits than its factorization.

816870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456.

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 816870 is about 903.8086080581. The cubic root of 816870 is about 93.4797729511.

The spelling of 816870 in words is "eight hundred sixteen thousand, eight hundred seventy".