2780988 has 24 divisors (see below), whose sum is σ = 7416192. Its totient is φ = 794544.

The previous prime is 2780971. The next prime is 2780993. The reversal of 2780988 is 8890872.

It is a happy number.

It is a super-2 number, since 2×2780988² = 15467788512288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16470 + ... + 16637.

It is an arithmetic number, because the mean of its divisors is an integer number (309008).

2^2780988 is an apocalyptic number.

2780988 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

2780988 is an abundant number, since it is smaller than the sum of its proper divisors (4635204).

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

2780988 is a wasteful number, since it uses less digits than its factorization.

2780988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33121 (or 33119 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 42.

The square root of 2780988 is about 1667.6294552448. The cubic root of 2780988 is about 140.6262421619.

The spelling of 2780988 in words is "two million, seven hundred eighty thousand, nine hundred eighty-eight".