1623285720 has 288 divisors, whose sum is σ = 6405441120. Its totient is φ = 354816000.

The previous prime is 1623285689. The next prime is 1623285721. The reversal of 1623285720 is 275823261.

1623285720 is a `hidden beast` number, since 1 + 62 + 3 + 28 + 572 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1623285721) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 403720 + ... + 407720.

It is an arithmetic number, because the mean of its divisors is an integer number (22241115).

Almost surely, 2^1623285720 is an apocalyptic number.

1623285720 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 1623285720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3202720560).

1623285720 is an abundant number, since it is smaller than the sum of its proper divisors (4782155400).

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

1623285720 is a wasteful number, since it uses less digits than its factorization.

1623285720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4055 (or 4041 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 1623285720 is about 40290.0201042392. The cubic root of 1623285720 is about 1175.2537782916.

The spelling of 1623285720 in words is "one billion, six hundred twenty-three million, two hundred eighty-five thousand, seven hundred twenty".