816090 has 32 divisors (see below), whose sum is σ = 2137536. Its totient is φ = 197760.

The previous prime is 816077. The next prime is 816091. The reversal of 816090 is 90618.

816090 = 402² + 403² + ... + 406².

It is a self number, because there is not a number n which added to its sum of digits gives 816090.

It is not an unprimeable number, because it can be changed into a prime (816091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 907 + ... + 1566.

It is an arithmetic number, because the mean of its divisors is an integer number (66798).

2⁸¹⁶⁰⁹⁰ is an apocalyptic number.

816090 is an abundant number, since it is smaller than the sum of its proper divisors (1321446).

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

816090 is a wasteful number, since it uses less digits than its factorization.

816090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2494.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 816090 is about 903.3769977147. The cubic root of 816090 is about 93.4500099766.

The spelling of 816090 in words is "eight hundred sixteen thousand, ninety".