1620320 has 96 divisors (see below), whose sum is σ = 4445280. Its totient is φ = 552960.

The previous prime is 1620319. The next prime is 1620329. The reversal of 1620320 is 230261.

It is a junction number, because it is equal to n+sod(n) for n = 1620295 and 1620304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620329) 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, 39500 + ... + 39540.

It is an arithmetic number, because the mean of its divisors is an integer number (46305).

2^1620320 is an apocalyptic number.

1620320 is a gapful number since it is divisible by the number (10) 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 1620320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2222640).

1620320 is an abundant number, since it is smaller than the sum of its proper divisors (2824960).

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

1620320 is a wasteful number, since it uses less digits than its factorization.

1620320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88 (or 80 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 1620320 is about 1272.9179078008. The cubic root of 1620320 is about 117.4537617978.

Adding to 1620320 its reverse (230261), we get a palindrome (1850581).

It can be divided in two parts, 1620 and 320, that multiplied together give a square (518400 = 720²).

The spelling of 1620320 in words is "one million, six hundred twenty thousand, three hundred twenty".