816485775 has 96 divisors (see below), whose sum is σ = 1667750400. Its totient is φ = 351106560.

The previous prime is 816485773. The next prime is 816485851. The reversal of 816485775 is 577584618.

It is a happy number.

816485775 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 816485775 - 2¹ = 816485773 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816485773) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 436392 + ... + 438258.

It is an arithmetic number, because the mean of its divisors is an integer number (17372400).

Almost surely, 2^816485775 is an apocalyptic number.

816485775 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

816485775 is an abundant number, since it is smaller than the sum of its proper divisors (851264625).

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

816485775 is a wasteful number, since it uses less digits than its factorization.

816485775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1918 (or 1899 counting only the distinct ones).

The product of its digits is 1881600, while the sum is 51.

The square root of 816485775 is about 28574.2152123204. The cubic root of 816485775 is about 934.6511419328.

It can be divided in two parts, 8164 and 85775, that added together give a palindrome (93939).

The spelling of 816485775 in words is "eight hundred sixteen million, four hundred eighty-five thousand, seven hundred seventy-five".