1783920640 has 192 divisors, whose sum is σ = 4617194400. Its totient is φ = 659423232.

The previous prime is 1783920631. The next prime is 1783920647. The reversal of 1783920640 is 460293871.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 1783920593 and 1783920602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1783920647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10311594 + ... + 10311766.

Almost surely, 2^1783920640 is an apocalyptic number.

1783920640 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 1783920640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2308597200).

1783920640 is an abundant number, since it is smaller than the sum of its proper divisors (2833273760).

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

1783920640 is a wasteful number, since it uses less digits than its factorization.

1783920640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272 (or 252 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 1783920640 is about 42236.4847022098. The cubic root of 1783920640 is about 1212.8074147364.

The spelling of 1783920640 in words is "one billion, seven hundred eighty-three million, nine hundred twenty thousand, six hundred forty".