1623842640 has 240 divisors, whose sum is σ = 6463836288. Its totient is φ = 371132928.

The previous prime is 1623842629. The next prime is 1623842653. The reversal of 1623842640 is 462483261.

1623842640 is a `hidden beast` number, since 1 + 6 + 2 + 3 + 8 + 4 + 2 + 640 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

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

It is a junction number, because it is equal to n+sod(n) for n = 1623842595 and 1623842604.

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, 130114 + ... + 142046.

Almost surely, 2^1623842640 is an apocalyptic number.

1623842640 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 1623842640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3231918144).

1623842640 is an abundant number, since it is smaller than the sum of its proper divisors (4839993648).

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

1623842640 is a wasteful number, since it uses less digits than its factorization.

1623842640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11968 (or 11950 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 36.

The square root of 1623842640 is about 40296.9309005041. The cubic root of 1623842640 is about 1175.3881657029.

The spelling of 1623842640 in words is "one billion, six hundred twenty-three million, eight hundred forty-two thousand, six hundred forty".