2821689720 has 96 divisors (see below), whose sum is σ = 9177386400. Its totient is φ = 751885056.

The previous prime is 2821689667. The next prime is 2821689727. The reversal of 2821689720 is 279861282.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2821689727) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 728509 + ... + 732371.

It is an arithmetic number, because the mean of its divisors is an integer number (95597775).

Almost surely, 2^2821689720 is an apocalyptic number.

2821689720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2821689720 is an abundant number, since it is smaller than the sum of its proper divisors (6355696680).

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

2821689720 is a wasteful number, since it uses less digits than its factorization.

2821689720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5909 (or 5902 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 2821689720 is about 53119.5794411063. The cubic root of 2821689720 is about 1413.0897688050.

The spelling of 2821689720 in words is "two billion, eight hundred twenty-one million, six hundred eighty-nine thousand, seven hundred twenty".