1623840660 has 144 divisors (see below), whose sum is σ = 5321447040. Its totient is φ = 398442240.

The previous prime is 1623840619. The next prime is 1623840671. The reversal of 1623840660 is 660483261.

1623840660 is a `hidden beast` number, since 16 + 238 + 406 + 6 + 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 an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 885945 + ... + 887775.

Almost surely, 2^1623840660 is an apocalyptic number.

1623840660 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 1623840660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2660723520).

1623840660 is an abundant number, since it is smaller than the sum of its proper divisors (3697606380).

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

1623840660 is a wasteful number, since it uses less digits than its factorization.

1623840660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2238 (or 2233 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 1623840660 is about 40296.9063328688. The cubic root of 1623840660 is about 1175.3876879740.

The spelling of 1623840660 in words is "one billion, six hundred twenty-three million, eight hundred forty thousand, six hundred sixty".