816562 has 8 divisors (see below), whose sum is σ = 1228716. Its totient is φ = 406992.

The previous prime is 816559. The next prime is 816581. The reversal of 816562 is 265618.

It can be written as a sum of positive squares in 2 ways, for example, as 811801 + 4761 = 901^2 + 69^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×816562³ = 1633385707738848984, which contains 333 as substring.

It is a plaindrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 816562.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 748 + ... + 1480.

2⁸¹⁶⁵⁶² is an apocalyptic number.

816562 is a deficient number, since it is larger than the sum of its proper divisors (412154).

816562 is a wasteful number, since it uses less digits than its factorization.

816562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1292.

The product of its digits is 2880, while the sum is 28.

The square root of 816562 is about 903.6382019370. The cubic root of 816562 is about 93.4680226565.

It can be divided in two parts, 816 and 562, that added together give a triangular number (1378 = T₅₂).

The spelling of 816562 in words is "eight hundred sixteen thousand, five hundred sixty-two".