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816480 = 253657

816480 has 168 divisors, whose sum is σ = 3305232. Its totient is φ = 186624.

The previous prime is 816469. The next prime is 816499. The reversal of 816480 is 84618.

It is a tau number, because it is divible by the number of its divisors (168).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

816480 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 116637 + ... + 116643.

It is an arithmetic number, because the mean of its divisors is an integer number (19674).

2816480 is an apocalyptic number.

816480 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 816480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1652616).

816480 is an abundant number, since it is smaller than the sum of its proper divisors (2488752).

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

816480 is an equidigital number, since it uses as much as digits as its factorization.

816480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40 (or 17 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 816480 is about 903.5928286568. The cubic root of 816480 is about 93.4648938333.

It can be divided in two parts, 816 and 480, that added together give a 4-th power (1296 = 64).

The spelling of 816480 in words is "eight hundred sixteen thousand, four hundred eighty".