2807840 has 96 divisors (see below), whose sum is σ = 7983360. Its totient is φ = 912384.

The previous prime is 2807821. The next prime is 2807851. The reversal of 2807840 is 487082.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25706 + ... + 25814.

It is an arithmetic number, because the mean of its divisors is an integer number (83160).

2^2807840 is an apocalyptic number.

2807840 is a gapful number since it is divisible by the number (20) 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 2807840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3991680).

2807840 is an abundant number, since it is smaller than the sum of its proper divisors (5175520).

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

2807840 is a wasteful number, since it uses less digits than its factorization.

2807840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154 (or 146 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 29.

The square root of 2807840 is about 1675.6610635806. The cubic root of 2807840 is about 141.0774016287.

The spelling of 2807840 in words is "two million, eight hundred seven thousand, eight hundred forty".