2172783840 has 48 divisors (see below), whose sum is σ = 6844270608. Its totient is φ = 579408896.

The previous prime is 2172783839. The next prime is 2172783853. The reversal of 2172783840 is 483872712.

It is a tau number, because it is divible by the number of its divisors (48).

It is a junction number, because it is equal to n+sod(n) for n = 2172783792 and 2172783801.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2262837 + ... + 2263796.

It is an arithmetic number, because the mean of its divisors is an integer number (142588971).

Almost surely, 2^2172783840 is an apocalyptic number.

2172783840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2172783840 is an abundant number, since it is smaller than the sum of its proper divisors (4671486768).

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

2172783840 is a wasteful number, since it uses less digits than its factorization.

2172783840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4526651 (or 4526643 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 42.

The square root of 2172783840 is about 46613.1294808662. The cubic root of 2172783840 is about 1295.2059798671.

The spelling of 2172783840 in words is "two billion, one hundred seventy-two million, seven hundred eighty-three thousand, eight hundred forty".