1604322720 has 1152 divisors, whose sum is σ = 7818612480. Its totient is φ = 301916160.

The previous prime is 1604322689. The next prime is 1604322737. The reversal of 1604322720 is 272234061.

1604322720 is a `hidden beast` number, since 1 + 604 + 32 + 2 + 7 + 20 = 666.

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

It is a zygodrome in base 4.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 30270214 + ... + 30270266.

It is an arithmetic number, because the mean of its divisors is an integer number (6786990).

Almost surely, 2^1604322720 is an apocalyptic number.

1604322720 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 1604322720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3909306240).

1604322720 is an abundant number, since it is smaller than the sum of its proper divisors (6214289760).

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

1604322720 is a wasteful number, since it uses less digits than its factorization.

1604322720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115 (or 94 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 1604322720 is about 40053.9975533030. The cubic root of 1604322720 is about 1170.6594572943.

Adding to 1604322720 its reverse (272234061), we get a palindrome (1876556781).

The spelling of 1604322720 in words is "one billion, six hundred four million, three hundred twenty-two thousand, seven hundred twenty".