2775840 has 48 divisors (see below), whose sum is σ = 8745408. Its totient is φ = 740096.

The previous prime is 2775781. The next prime is 2775841. The reversal of 2775840 is 485772.

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

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (2775841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2412 + ... + 3371.

It is an arithmetic number, because the mean of its divisors is an integer number (182196).

2^2775840 is an apocalyptic number.

2775840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2775840 is an abundant number, since it is smaller than the sum of its proper divisors (5969568).

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

2775840 is a wasteful number, since it uses less digits than its factorization.

2775840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5801 (or 5793 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 33.

The square root of 2775840 is about 1666.0852319134. The cubic root of 2775840 is about 140.5394155782.

The spelling of 2775840 in words is "two million, seven hundred seventy-five thousand, eight hundred forty".